Shirasaka Koume (B-Day Fanart)

Gaaaaah I didn't quite make it in time, I feel so bad. ;___;
Still! I put a lot of time and effort into this. I hope it shows!

For those that don't know, Koume here is an idolmster cutie that is into gothic and horror stuff, and I find her super fun so I thought I'd use her birthday as an excuse to make myself do some fanart. Did I do anything right? What did I do wrong? Let me know in the comments. Every new digital art piece is an experiment in one way or another, and I'd really appreciate some pointers and suggestions, especially if it applies to Paint Tool Sai.

Cool recording if you want to hear her owo: www.youtube.com/watch?v=hxx2kF…