imageThomas, in a comment, wonders:

. . . I’ve noticed the past few days that there appears to be a misalignment between the left and right shoulders / neck region. In particular, one side is lower than the other as if there was a dislocation. This corresponds with the arm positions on the frontal image ie. the right shoulder is set lower, as is the right arm.

This would seem to be an argument in favour of the image being generated from a real human (dead) body.