Minor critique odf. I thinking your starting to lapse into a bit of faffing about with the smile here. There's no way anyone's smile is going to look like your last image without sticking their fingers into their mouth corners and pulling outward as you see children do. A smile morph, open/closed should take a sitting to make, and that's a generous estimate. You're over elaborating to the realm of caricature. Just move on to the next set of expressions.