The only big problem I see is the fact that it looks like he has no hair on the back of his head, because you didn't draw hair right next to his neck to make it look like he has hair on the back of his head. Another thing is the neck looks kind of awkward but other than that it looks pretty good.
@[email protected] I can't work with hair. I don't know how it goes, how its supposed to look, and if I shade it, it turns out like they're wearing an odd hat.