John,
Fun looking character! The only comment I have for now is a caution related to the creation of facial morph targets, particularly for the mouth. The targets you've created look good in a sense, but those that open the mouth to any degree are completely leaving out the movement of the actual jaw. And with a chin as pronounced as you've got on that guy, it's really obvious when the jaw isn't moving when it should be. Keep in mind that the lower teeth are connected to the jaw bone, so if his lower teeth go anywhere, the jaw should be driving that motion.
Looking forward to seeing more. Keep at it!