Very nice!!! The only thing I could think to mention is that I'd like to see some definition in the teeth. His molars I think should be slightly darker than his front teeth, just to give some depth to his mouth. I love the use of texture in this piece. It really helps to give what would otherwise be a flat, but nifty, piece some visual interest.
I have 33 words left. I hate this 100 word minimum. I think this and your Wolvie piece would make great POP art-style prints. Do them up in 24"x36" Panels, and I could see them adorning my wall.
Totally agree with you. In fact, I've amended this pic since anyway (to lighten the choppers for depth of field clarity), so I'll go back in and look at those teeth! Before I re-post though, I'll wait for any more suggestions! Three versions might be a bit much...
Thanks muchly for spending the time to critique this!