Funny head, so I've decided to made it in a good pixel art :=)
Well, NerdofChaos, as they said, if you want to improve your skill, the main thing is to learn pixel art techniques : Anti -aliasing, Dither and other...
and don't draw quicky if you want help, comments, etc...
I think that my edit could help you in Anti-alising and in "direction" : a sort of background for exemple to integrate the head instead of this full white...