Hair looks kind of messy. Might want to clean that up a bit. What you really shouldn't do with pixel art is detailing hair, strand by strand because normally, pixel art are small pieces and if you use even a pixel of thickness for hair, it ends up looking bad because hair should appear thinner that that.
Here is a great example of something you COULD do when doing hair: www.pixeljoint.com/pixelart/13995.htm
Thank you for your advise! i'll follow it. yes) i've just joined. Thanks)
The bacground square is distracting. It doesnt have much point. Removing it could improve the piece. Oh and welcome to PJ, you seem to have just joined. Judging by your points and amount of works.
Many thanks for your comment! That example picture is wonderful. I'll try not to make this mistake in future