Draw over a bitmap

Hey

So Basically ive got a bitmap drawing of a body so that i can asset warp it to have the body bend. Ive then converted it to frame by frame so that i can draw in some bend wrinkles over the body on each frame as it bends, however when i try to draw them as soon as i stop thr stroke it get put behind the body.

Ive tried right clinging and sending the body to the back but that doesnt seem to work is there something else i can try 

Thanks