Context: "4.jpg" is (i think) Yukina (vocalist), "5.jpg" is Ako (drummer), "6.jpg" is Lisa (bassist), "7.jpg" is Rinko (keyboardist), and "8.jpg" is Sayo (guitarist).
The numbers represent the key count of the difficulties the images are being used for (e.g. the picture of Ako is used for all 5K diffs).
With that in mind, I suggest using the picture of Lisa for 4K (as she is the bassist, and bass guitars have 4 strings); and using the picture of Sayo for 6K (as 6 strings).
I will also suggest reconsidering all BGs on this basis.
??
Honestly i don't think that too far smh 🤣🤣🤣
My reason for the order for the BG is actually :
4K : most player of osu!mania are mainly play 4K so i think i put yukina as the main represent of the roselia for It.
5K : Actually i had fun on mapping 5K lately. I used Ako for representing that like his character
6k and 8K : just random put 🤭🤭🤭
7K : she is my favorite character for the roselia member even in the real band. That same as 7K as my favorite key mode.
I have no intention to change the BG order
Audio: too big size, i convert to ogg q5 to 2mb https://cdn.discordapp.com/attachments/978558402068353024/1050792500580847656/viank.ogg
BG: 1mb kinda big too for jpeg format here i convert it too
https://cdn.discordapp.com/attachments/978558402068353024/1050794456342868048/Pictures.rar
ODHP: Good
HS File: Good no delay, have a hitnormal
Bisa Lebih Gede Gak?
https://prnt.sc/eTTR6XDvgk8I
Pake Ini Aja, Offset Sama
https://cdn.discordapp.com/attachments/1010171974661701732/1030784837767921714/audio.mp3
Spectro: https://prnt.sc/7j70tqUqJAm4
https://drive.google.com/file/d/1RKpEOiNsYFAyyjX3yt0bR12-s3lpHpzL
i think this can help. but, i make rescale size and more clearer version of BG to you
https://drive.google.com/file/d/1fv78bQhjivVSBfMso9iRdSwW-tCAM89t
also for audio, make a bit increase clipping with 19KHz
Spectro: https://cdn.discordapp.com/attachments/857545268966195210/923634529887989840/unknown.png