O wow...don mess with him and his books... Anyways, the expression is pretty kool. Try to make the hair more smooth as it is going everywhere. Also, make his chin a bit more pointy and less flat.
He looks too manly, but it was a good try. Great expression, but I wouldn't recommend drawing individual lines between his teeth.
great job with the hair, but the face doesn't seem right with it or it could be the other way around o.o
