Hehe... cool BillyZ.

Add nosethrills and eyelids. That will help alot. The eyes are might too far from each other. But that may be the look you wish.

Im not sure about the teeth. They looks like the're done in a hurry, but they kinda looks ok to me at this stage. You might wanna change 'em later. Maybe caligraphics can make us all a tut about the cool teeth he're creating ;-)