Since you are new to mapping try mapping with distance snap on and if you are not going to make other difs try to map starting section and make it reach 5 minutes of drain time so it is possible for marathon map.

Remember always put circles and sliders on 1/2 tick unless its stream
00:21:689 (3) - move one tick to white like this

00:22:591 (1) - try this

and fix all further circles and slider that are not on 1/2 tick. If you are unsure set playing speed to 50% and listen carefully
00:24:722 (2,3,5,8) - ^
00:30:870 (2,2,3,4,1,3,4) - ^
00:47:345 (5) - ^
01:21:034 (3) - no circle after this?

19:40 Valeze: yeah ^^
19:40 Valeze: sorry i was on overwatch eheh :/
19:40 Valeze: still here too ?
19:40 Fursum: ye
19:40 *Fursum is playing [https://osu.ppy.sh/b/1360789 Helblinde - Call of the void [Lost in the void]] -NoFail
19:41 Valeze: some feedbacks ? ^^
19:41 Fursum: im gonna play it first
19:42 Valeze: yay
19:42 Fursum: you are supposed to spec now
19:42 Valeze: it's my first map, so be rude with me >.<
19:47 Fursum: first of all, you need a higher od
19:47 Valeze: od ?
19:47 Fursum: overall diff
19:48 Valeze: oh ok !
19:48 Valeze: yeah i know, i go up this
19:48 Fursum: 00:29:556 - dont make those kinds of streams
19:48 Fursum: they look bad and play bad as well
19:49 Fursum: also try to keep the stream numbers odd
19:49 Fursum: like 1,3,5,7 etc
19:49 Fursum: so the players end with the same finger they start
19:49 Fursum: unless the rythm really suggests otherwise
19:49 Valeze: oh didnt't know that O.O
19:50 Fursum: 00:31:605 (1) - when mapping long sliders
19:50 Fursum: make sure there are no other sounds in the slider body
19:50 Fursum: for example this skips over two important sounds
19:50 Fursum: 00:31:933 - 00:32:261 -
19:50 Fursum: also theres a wub 00:32:097 -
19:51 Valeze: oh, just wanted to make this my beatmap easier
19:51 Valeze: but yeah, you are right
19:51 Fursum: if you are going to map a marathon theres no point in doing that
19:52 Valeze: i'm going to make a marathon x)
19:52 Fursum: 01:19:556 (1,2,3,4) - dont do this
19:52 Fursum: they play like normal circles
19:53 Valeze: oki ^^
19:53 Valeze: thanks a lot helping and taking your time for me :s
19:53 Fursum: the rythm is almost fine if you move them forwards but dont do the spacing like that
19:53 Fursum: im not done yet
19:53 Valeze: post a message here, i'll giv you a kudosu
19:53 Valeze: t/619069
19:54 Valeze: eheh ^^"
19:54 Fursum: so you need to change your mindset about the object placement
19:55 Fursum: for example
19:55 Fursum: 02:16:523 (7,8) - these two objects appear partially under the slider
19:55 Fursum: because of that, they look bad
19:55 Fursum: same idea goes for slider to sliders
19:55 Fursum: 02:23:081 (5,7) -
19:55 Valeze: right, i change this
19:56 Fursum: 02:27:507 (3,4,5,6,7) - dont break the burst shapes like this
19:56 Fursum: most of them should be simple
19:56 Fursum: 02:30:130 (4,5,6,7,8) - same thing
19:56 Fursum: you can keep the idea but tone it down
19:56 Fursum: this makes the stream harder because the movement is more strict
19:57 Valeze: i'll make it closer ^^
19:58 Fursum: 03:21:769 (7,1) -
19:58 Fursum: the pattern needs to change 03:22:097 -
19:58 Fursum: if you are doing these kinds of things
19:58 Fursum: change the patterns at strong notes
19:58 Fursum: also most of the section here 03:21:933 - is offbeat
19:59 Valeze: i put slider on piano notes.. :S
19:59 Fursum: but heads fall into weak notes
19:59 Fursum: ends fall into strong notes
19:59 Fursum: when making slider art
20:00 Fursum: 03:35:704 (4) - put a red anchor before every curve
20:00 Fursum: to make it look smoother
20:00 Valeze: a red anchor ?
20:00 Fursum: if you double click while placing an anchor
20:01 Fursum: it becomes red and it makes the edge sharp
20:01 Valeze: oh ok
20:01 Fursum: if you put one before and after every curve
20:01 Fursum: the curves will look smoother and be easier to adjust
20:02 Valeze: roger that
20:03 Valeze: i have a lot of work XD
20:03 Fursum: https://osu.ppy.sh/ss/8664957
20:03 Fursum: small example
20:03 Valeze: enjoying that
20:04 Valeze: oh, yeah it's really better like this :O
20:05 Valeze: 02:10:000 -> 02:20:000
20:05 Valeze: this part is good ? i make some "slider arts " xD
20:06 Fursum: hmm
20:06 Fursum: did you put a circle slider under that while making it
20:06 Fursum: also there are ways to create perfect circles with many anchors
20:07 Fursum: they are the best in the map only because you used red anchors lol
20:07 Valeze: like a shape ? good idea !
20:07 Fursum: they can be better though
20:07 Fursum: 02:13:900 (6) - like this ones head and end stands out
20:07 Valeze: i take it from the osu forum xD i'm not an artist :S
20:08 Fursum: 02:17:835 (1) - dont use these kinds of shapes
20:09 Fursum: only use simple curves as a start
20:10 Valeze: alright
20:10 Fursum: also there are problems with note density
20:10 Fursum: 02:47:999 - like here
20:10 Fursum: the music is more intense
20:10 Fursum: but you used way less notes
20:11 Valeze: yeah, this is stupid :/
20:11 Fursum: 03:50:950 - same with here
20:11 Fursum: you have many gaps that could have notes
20:11 Fursum: since this is a kiai
20:12 Fursum: dont even have 1/1 gaps
20:12 Fursum: unless the music like stops
20:12 Valeze: i dont understand... sorry my english suck
20:13 Fursum: 03:50:950 (1,2) - you have empty space here
20:13 Fursum: and many other places
20:13 Fursum: this is bad for kiai
20:13 Fursum: or like here 03:54:884 (6,7) -
20:13 Fursum: this is a 1,5 beat space
20:14 Valeze: Oh, i understand ^^
20:14 Valeze: i know my job :3
20:14 Fursum: also
20:14 Fursum: your spacing is very low on 1/2 notes
20:15 Fursum: 04:25:868 (5,6,7,8,9) - its mostly like this
20:15 Fursum: no reason to have small spacing
20:15 Valeze: maybe i have to work more with "distance snapping"
20:16 Fursum: not really
20:16 Fursum: ill draw something one moment
20:16 Valeze: take your time ^^
20:17 Valeze: i can not thank you enough ! you are taking a lot of your time for me ^^
20:17 Fursum: no problem
20:19 Fursum: so i want to show you something about visual spacing
20:19 Fursum: https://puu.sh/wR5b4/d635d40d84.png
20:19 Fursum: you have something like this
20:20 Fursum: see how 6 and 8 are very close to each other
20:20 Fursum: try avoiding that if you have no reason
20:21 Fursum: this applies to every other pattern
20:21 Fursum: try having the same distance between every object in a pattern unless you have like big spacing for strong notes
20:22 Valeze: hum, i see, i have to make this "symetrical" in the same pattern
20:22 Fursum: you dont have to make it symmetrical
20:22 Fursum: just dont have random space between objects
20:22 Fursum: heres another example
20:22 Fursum: 04:11:113 (1,2,3,4) -
20:22 Fursum: 1 and 2 is close and 3-4 is far
20:23 Valeze: oh ok, i understand what you means
20:23 Fursum: 04:27:999 - these objects are very close to each other
20:23 Fursum: doesnt look good
20:24 Fursum: also do you know about blanketing
20:25 Valeze: no :/
20:25 Valeze: i know nothing (jon snow)
20:25 Valeze: :S
20:26 Fursum: so you have this https://puu.sh/wR5sm/b250128802.png
20:26 Fursum: and you could do this to make it look better https://puu.sh/wR5sm/b250128802.png
20:27 Fursum: the second one is called blanket
20:27 Valeze: meh, its the same image xD
20:27 Fursum: oops
20:27 Valeze: xD
20:27 Fursum: https://puu.sh/wR5qY/0459ceda76.png
20:27 Fursum: this is your placement
20:27 Fursum: 02:07:015 - here
20:29 Fursum: same thing can be done with sliders https://puu.sh/wR5wV/fb7bee44e8.png
20:29 Valeze: uhm
20:30 Fursum: https://puu.sh/wR5zI/4c99b50e95.jpg
20:30 Fursum: heres a different shape
20:30 Fursum: you basically make the distance same on every part of the objects
20:30 Fursum: [https://puu.sh/wR5zI/4c99b50e95.jpg if the link is broken]
20:31 Fursum: i have to go sorry
20:31 Valeze: np np ^^

00:22:097 (3) - i don't think that there is a need to map this sound, so removing circle would be fair
00:23:081 (4) - same
00:22:835 - you skipped important sound emphasized already before (00:21:114 (1,2) - )
00:23:409 - it feels unnatural to have this important sound on the end of slider. Taking into accound previous point, this part should be like http://puu.sh/wR2nI/791d4f9407.jpg 00:27:999 (2,3) - should be fixed same way
00:24:556 (1,2,3) - good one
00:25:376 - same problem as before. You can move this slider 00:25:212 (5) - to the next white tick and place circle on the red
00:26:032 - ^
00:26:359 - and 00:26:687 - all the same
00:26:032 - i think placing 3/4 slider here is good idea. something like this http://puu.sh/wR4nY/dcf996d3b3.jpg
00:25:376 - skipped
00:29:556 (1,2,3,4,5,6,7) - i don't see any changes in music or any sounds that justify stream here. It doesn't fit the song i guess, so it should be mapped with emphasizing beats as before.
but you can make stream started from here 00:30:622 - for a five notes. This one would be natural to play
00:29:966 - skipped important sound
00:30:458 - ^
00:30:212 - you can make 3/4 slider started from here. like this http://puu.sh/wR4Rt/7728aaa277.jpg because rhythm isn't natural enough to follow with circles
00:31:605 - music has become way more intense here with many streams in it and you started mapping piano with 3/2 long sliders. So map something faster there
00:48:654 (7) - top of the slider is off-screen, fix it
00:52:589 - 01:02:097 - like this part
01:02:097 (7) - top of the slider is off-screen, fix it
01:03:081 - skipped beat. You can make slider 1/4 shorter (with end on blue tick) and place another slider here
01:04:392 (8) - this slider is too long for intense kiai, don't you think? even if you won't replace it with something fast, make it at least as 1/1 slider with reverse
01:10:950 (8,9) - almost good example what you can make. Only mistake here is that first and second sliders should be 3/4 long ending on blue ticks
01:12:261 (9,10) - same but you can make second slider 1/1 ending on white tick because you emphasize other sounds after this (01:13:081 (1,2,3,4) - )
01:21:441 (8,9) - ^
01:22:917 - i hear triple here and it's the sounds you mapping there, so you can make slider end here 01:22:917 - , put circle here 01:22:999 - , and start 1/1 slider here 01:23:081 - . It's pretty good i think.
01:37:179 - you suddenly started mapping another sounds. Better to make this part like one you made before: 01:26:687 (1,2,3,4,5,6,7,8,9) -
01:42:425 (4,5,6,7,8,1,2,3,4,5) - i can't see any reasons for streams. Some 1/1 sliders are enough.
02:06:032 (1,2,3) - decrease volume for this objects
02:11:277 (5,6) - i suggest you to separate these 2 sliders into 4 because you miss important sounds here 02:12:589 - and here 02:15:212 - which are the same with 2 you start your sliders on
02:17:835 (1,2,3,4,5,6,7) - this is too different and inconsostent from part before without any changes in music
02:20:458 (1,2,3,4,5,6,7) - and another way you map same sounds, such variations are unjustified there.
02:27:343 - skipped important sound
02:29:638 - 03:06:032 - nice part except some mistakes i'm about to mention
02:36:195 - should be stream from this point i guess
02:37:999 (2,4,4,9) - suddenly started make streams as short reversed sliders for too long. At least alternate it with common streams because it feels too slow in comparision with previous way you mapped this part.
02:46:687 - skipped stream
02:47:999 - again about consistensy. Aslo these sliders are too long for the intensivity of this part.
02:58:491 - ^
03:07:343 - you can start spinner here or on the better on the next white tick or you can continiue to map piano. Anyway these two streams 03:07:999 (1,2,3,4,5,1,2,3,4,5) - should be removed. If spinner is not the case, then you can start one big stream here 03:07:671 - with low volume on it
03:09:474 - put circle here if you map piano (there is nothing else to map anyway)
03:12:261 (5,7) - replace kicksliders with circles. Nothing special in music for kicksliders.
03:21:933 (1,2,3,4,5,6,7,1,2,3,4,5) - it feels weird having sliders on red ticks and also 03:22:097 - strong piano sound so there is no way to start sliders on red ticks
03:29:966 - 03:50:622 - like this part
03:48:327 (1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,9) - i think something like this http://puu.sh/wR86k/6f3fbb9d9e.jpg is more suitable. Expample: http://puu.sh/wR844/c446105dea.jpg
03:50:950 - this second kiai has only 1/2 rhythms so there is no need to use triplets or 5-note streams
04:03:573 (1,2,3,4,5) - sliders with begining on red ticks have leave weird feeling when being played.
04:10:458 - missed important sound
04:38:163 (1,2) - consistensy. remove sliders and map this part like you mapped before this moment, it was good
04:48:654 (1,2) - ^
04:53:900 - starting from this point song doesnt have sound for this note 04:54:720 (4) - anymore so remove it and all same after. Wow, even some unnecessary consistancy finally
04:59:146 (1,2) - well you can leave it as is because music doesn't have many sounds now +became more peaceful so piano became important enough. Next sliders too.

00:11:605 (2) - Maybe try to make this rounder


00:16:851 (4) - Add a curve around here will maybe be better


00:38:818 (9) - Try to make this note more fitting please

00:40:458 (3,4,5,6) - This shape or placements for the circle and sliders are very uncommon

00:50:457 (2,3) - Try to make this parallel

01:13:573 (4,5) - Make these sliders follow each other properly (01:14:884 (8,9) - this too)


01:45:048 (3) - NC because SV change

02:19:474 (5) - rethink about this slider shape

02:20:458 (1,2,3) - 1 and 3 's slider end won't look nice when it collide

02:30:786 (1,2,3) - 1 and 3 is not in the same place . is this intentional

02:35:376 (2,3,4,5,6) - make this pattern distance the same

03:02:589 (2,3,4) - u can see here 3 and 4's distance is shorter than 2 and 3 but they are the same rhythm

03:05:540 (3,4,5,6,7) - distance not the same makes it hard to follow

03:12:917 (1,2) - maybe don't overlap these

03:26:032 (1) - slider art please (03:27:343 (2) - )

03:30:458 (3) - this slider shape looks odd

03:35:704 (4) - make both sides of slider symmetrical

03:45:704 (1,2,3,4) - they are the same beat but their distance is not the same , they should be the same

03:49:638 (9) - slider head looks out of place

03:54:884 (6) - ignored too much sounds

03:58:327 (3,4,5) - out of place

04:06:359 (3,4) - distance should be the same

04:20:458 (2) - slider end has important sound, need fix

04:32:589 (1) - don't NC this

04:32:916 (3) - NC here

04:43:081 (4,1) - looks weird

04:54:228 (2,3,4,5) - 2-3 , 3-4 's distance not the same

04:59:146 (1,2) - odd placement for slider, make it more curved

04:59:146 (1,2) - here u didn't put a circle in between ,05:04:392 (1,2,3) - but here you did, there are no sounds though (05:09:638 (1,2,3) - here too)

05:14:884 (1) - try to make them look the same