If I have a good photograph of someone's face, front-on and upright , I can use Windows Paint to cut out the background etc. But how can I apply the face to (say) the Poser 4 man's head so that his face looks realistic from various directions?

I have found how to hide his head, put a square plane (parented to his head) where his face should be, texture the square with the face as the diffuse image, mask off the background, and move the square to the right place; but the his head only looks right if seen from straight forward.

Here I have got Lloyd Bridges / Mike Nelson into the uniform of my (fictional) Sea Patrol.