Funny, I was going to ask you about this one next time I saw you. Now I don't have to! It turned out really well. This is good for a short / quick yawn, but I understand what KreepingSpawn is saying though about the timing. If this was a big yawn, which seems to be indicated by the large, stretched open mouth, it needs to last a little longer. Next time you yawn or even act it out, try to pinpoint how long a yawn lasts, especially in the mouth open position. Even though it never stops moving, that extreme open mouth does move ever so slightly when you hit it and stay on it for a little while before closing again. It's a lot more work, sure, but I think that's what KS is talking about. Good anticipation, settle, squash and stretch and maintaining the volumes of the character, even in S&S. Hard to do when doing frame by frame. I'm so out of practice with frame by frame I'd probably mess it up.