Skin: Your spinner-background.jpg has too large dimensions. It is 1024x768 when maximum allowed is 1023x692. A few pixels above won't hurt anyone, but this picture is much larger. You should cut it down to 1024x692 (or 1023x692).
Skin: Your cursor.png is 79x79, while maximum allowed is 63x63. You need to resize this.
Storyboard: Many of your white.png flashes are mistimed. Some are too early some are too late. You should fix them so they come right where they need to come. Some examples:
00:12:594 (1) - This slider is incorrectly snapped. The end is not on a blue tick. Fix it so it's on a blue tick please.
00:42:206 - You have 2 timing sections here, remove one.
00:42:206 (1,1,1,2,3,4,5) - Making combos like this is unnecessary. Try this: remove new combo from 00:42:594 (1) and 00:42:981 (1), then put a new combo on 00:43:174 (2). This makes more sense if you ask me.
[Sp3's Jubiko]
Use circle size 5 please, so the difficulty has more standard settings.
[Advanced]
00:42:206 - You have 2 timing sections here, remove one.
[Basic]
00:11:045 (1) - This spinner is too short for the easiest diff and the slider after it comes too soon. You should try to map some kind of a slider instead.
00:42:206 - You have 2 timing sections on this spot, remove one.
00:48:206 (1) - This spinner is too short for the easiest diff. Try this: http://puu.sh/b1x4.
01:31:561 (1) - This spinner is WAY too short for easiest diff. Remove it completely. Also add a break at 01:26:916.