I made an sloppy edit, just the face and the chest. Ignore the claw please. Some things:
-The purple doesn't work on the face, it's jarring in conjunction with the red.
-Not covering a full range with your colors, the skin tone's darkest color isn't nearly dark enough, which is why you used the purple I guess.
-I didn't see a need for both the bright skintone and the white to exist. You're not getting enough "punch" out of your highlights I think, you're using the highlights too freely without regard to the form really.
-Show the stretching with wrinkles. I tried to do this, also I put in haphazard eyelids which could be used to show the stretching also.
-The (our) right side of the mouth didn't really work for me, so I changed.
-Nice character.
He's fun to work with.
Also BOB that is a really great edit. Love the mouth especially.