Spend some time to study mouth shape mainly from KingKong trailer, Incredibles, Once upon a time in the west and Twilight Samurai.
That's so amazing how much mouth shape changes and we read many emotions from its shape. It's still hard for me to transfer what I know into 3d animation tho, There is too many things I hafta learn.
I shaved my head btw, I feel cold now. And my friend will be laughing at me in next semester for sure. Happy holiday for everyone. Maybe I will post more sketches later.