Model's position
I believe the answer is:
pose
'model's position' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pose that I've seen before include "Assume an attitude (for photo etc)" , "Pretend to be somebody else" , "Models do it for photographic or artistic purposes" , "Pretend; model" , "Sit for a painter" .)