Hey! This would be my first time posting my artwork for critique!

This peice is one that was started for a contest, 50 x 50 of a 'character' and only 4 colors may be used. I chose something similar to Game Boy colors.
My entry was this. Her hair was inspired by Nia from Tengen Toppa Gurren Lagann

After the contest was finished I started to expand on this piece further. I'm not "stuck' per-say as I like what I have, but I would like to see another point of view for things that could be fixed, done better, or added.