Most of it looks real good. Love the eyes. When the jaw opens the chin should drop but not the jaw joint. Right now it looks like she'd dislocating her jaw like a snake. Should be a simple fix, then it would be spot on.
You have talent and a good eye. A basic head turn is 'cylindrical' which means hair and features remain level as they change shape from the front view to the 3/4 view. In a pure horizontal head turn all point-to-point motion should be shift-dragged left or right. I held a piece of paper against the monitor to see if parts of her hair were moving up or down as her head turned.
Looks awesome, and I especially like that you are going for a realistic rather than cartoonish style. The mechanics of your head turn look great in both and I especially like the way she continues to look out at the viewer. Something did not look right with the wide jaw drop, something weird/overdone in first one, somewhat corrected but still looking weird (too much vertical stretch) in your adjusted 2nd version. I'm sure just a matter of practice and you will have some real striking visuals because your eye for what looks good and artistic talent is there. Keep it up!
Thanks for the feedback... maybe I'll just remove the wide jaw drop and go with the regular one ... I believe it'll look funny no matter how I try to fix it.
Maybe there's just too much vertical stretch as you say. I was going to use it for a really surprised look but maybe I can get it done with some less stretching
I don't think there's anyone who can open his/her mouth that much anyway without dislocating the jawbone first
The head doesn't appear rigid in turn, especially the eyes just float around and don't change shape enough.
AS 9.5 MacPro Quadcore 3GHz 16GB OS 10.6.8 Quicktime 7.6.6
AS 11 MacPro 12core 3GHz 32GB OS 10.11 Quicktime 10.7.3
Moho 13.5 iMac Quadcore 2,9GHz 16GB OS 10.15
Moho 14.1 Mac Mini Plus OS 13.5
Do not get discouraged. The amount of knowledge and talent in this forum really speeds up the learning process. I like to think that everybody's style is unique. Certain fundamentals for AS and animation in general are the same for all of us so we should always approach animation as 'students'. Someone will always think of something you never thought of before. You must keep at it!