Instead of wind up, I call it the lift because wind up is a pitching position not a phase of throwing. You have the wind-up and the stretch.
Cocking phase begins with the shoulders in line with the target and not squared to the target.
Acceleration Phase begins at max external rotation with full forearm layback. The picture above labeled acceleration, I would call pre-release and the point of max acceleration.
Deceleration begins at release and is well under way by the time of the fourth still image.