Very dynamic, like theJOE said. Chin might be too round (not sure what style is being aimed for). Needs AA, especially around mouth. Nose needs shading. Might want to make the skin highlight more obvious (not sure what shading style is being aimed for, either). Index finger is too thin.
The shirt's really nice, and the hair's good too.
Zutto tsuzukete!
Great perspective and clothes. Try do some antialiasing on next pixel arts;]
prob transparency. banding around mouth. use darker color for skin outline. eyes not symetrically placed.
@sharpm: thank you very much for the advice^^
@sinsky: yes you are rigth still many things to improve in my pieces,thanks bro^^
@ninja crow: Thank you very much bro....ooosh!!^^