Just a quick little update.
Not the most titillating or dynamic of shots, but a necessary one.
This shot is essentially a cropped and scaled up version of this shot:

Instead of just scaling it up (there wasn't enough resolution to do so, and it would've looked wrong either way), I've redrawn it and added detail in some areas (most notably, the fur on his outfit).
This shot is actually fully traditionally animated. I drew the extra mouth shapes, as well as the final smile with the teeth.

Hm, I might want to tweak a bit of the timing on that grin...