Might want to tweak that Spock model a bit, Ptrope. He looks kinda young. The chin/jaw area needs to be more prominent.
McCoy's mouth looks like it should be a little wider, too...a little less jowls.
Yeah, the Spock was done pretty quickly and isn't anywhere near a finished morph; McCoy was more a case of the lighting showing up flaws I hadn't seen previously under different lights.
Might have to start learning Z-Brush or Mudbox ...