oooh...this is a cool design. i especially like the background. i'm actually not having a problem with the mouth but with the eye. i think the line that defines the lower eyelid shouldn't curve as far down as it is. also, it would be cool if the muscle that goes from the back of the ear to the front of the neck is defined more. right now that line defining it looks a bit strange. other than that, up the contrast on the clothing and muscular/bone definition and you're golden. good piece.