I was fooling around in Sunset today and decided to make over a few Townies, I only did new hairstyles/colors, facial hair, sometimes eye color, makeup and "tans", but no facial features were tweaked ...
@Mikezumi out of curiosity, do you switch them to male (or vice versa) and then tweak them? This is something I've never tried to do before; if offspring need it I just tweaked them (although sometimes I don't change them at all). But I might try this the next time I do a makeover.