Hey John thanks for your comments.
About the "hair", it's already with dynamic constraint... I believe the motion blur have some kind of issue, because as you can see in the wireframe render ( attached ), the "hair" is working fine.
Here is a shot of final render with some weird blur (hair / hands) ( 16 passes )
The face rig isn't done yet ...
About the animation I struggled to make it as best I could... I'll work in the ball mass.
Thank you again, your comments are always welcome.
shaded.mov