There were a few tips I'd never seen yet, thanks for sharing.
I just randomly stumbled across this. It's an excellent for later reference to re-read those pointers, and also is one of the best-formatted tutorials I've read. Very tidy and legible.
I usually draw the mouth starting with a dot in the middle of the cupid's bow and work outward from there, but the two dots method seems much better! I'll try it out tonight, I think.