This is the next test render after this:
 

 
Testing how well the smile looks with the mouth closed.
 
IMPORTANT FOR THIS RENDER:  
I also did some testing on the reflectivity of the eyes. I recently added displacements and normal maps to the eyes so they are no longer shaded flat. I’m still uncertain if I should crank up the reflectivity, as the real reflections of the lights are clashing with the fake eye-shines that are textured onto the eyes (and they are necessary for show accuracy). The real question is for you guys is… Well, does it look like they are clashing to you? Or do they look fine together? If not, I’ll bring the reflectivity down to keep them more separate.