Aside from the BMP issue, I do have to say, it looks pretty good. I do think that retracting the right arm (left on the sprite) would work a bit better in the context of a singer, unless you actually you want it to look like she's holding both arms up (with the right arm slightly lowered), in which case the hand should be opened. The line-art implies that the hand should be on her chest though.
Oh, and the split could be moved a slight bit to the left (your left, not her).
Oh, and the split could be moved a slight bit to the left (your left, not her).