I like his hair! The shading is pretty good, and his expression is nice. Though I feel silly for not knowing him (I've only got the first 2 volumes. If he appears before the third, then I'm really dumb!) There are a few strands of hair that don't look altogether natural, but it's small and unnoticeable.
Wow this is awesome! You are such a good artist. I love the way its just simple pencil strokes and the shading is great. It looks really polished off with the black hat thing too. Wow!