Gosh. I hope someday I'll be able to produce work even half this good. I'm definitely enjoying looking at your work!
My sketches get so messy that even I have a hard time telling what I didZfox, i think you were putting the mouth at the bottom guideline instead of halfway between the bottom and the chin? I honestly don't know anymore... My process has become so ingrained its really hard to think about it and explain it verbally.
But yeah, I'm now watching how much space I have between the chin and the mouth.
Oh... And I'm a he btw =)