Here we have an early hand-made prototype of Skeletor.
His look is somewhere in between his concept-drawing and the finished toy.
His body is not yet based on the finalized male mold for the toyline, but instead on the early wax-prototype of the early He-man that sported a helmet.
This results in his body having more realistic proportions and a less hunched back and crouched look.
His face has more flesh left on it ( sporting a strange grin almost) and his feet are bare, and human-looking, like in his concept-sketch. His staff is also looking a bit rushed, not quite finished in time. The shaft of the Havoc Staff is replaced by a simple bronze-rod.
Image courtesy of Matt Jozwiak & Mark Taylor