Re-did the blendshapes for the mouth. Here's a test animation. I think the puffed cheeks work well...not so sure about the rest. Maybe getting to the teeth and toungue (and eyes) will help.
These didn't work so well. Besides the teeth and toungue not moving (which I haven't bothered with so far). There's obviously glitches. I think I'm going to delete them, add some topology, and try again.
Oh and the eyebrows still suck.