My reactions, FWIW:
The comment that the first one brings to mind is the use of the space on the left/upper left. I feel that the cloudy circular swirl recenters the eye to some degree, emphasizing the backwards bend of the model by comparison.
The second one looks like a classic portrait pose to me, except that the extreme rotation of the head disturbs me and overwhelms any consideration of the ideal placement of the model. Her eyes have a contemplative gaze out of the frame, but the head position with respect to her body would lead one to expect a dramatic look at the camera, as if something startling just occurred, or to say "I see what you're up to!"
The second image was used for a CD cover and flipped in the final edit so she is looking left to right & the negative space was expanded and used for track listing and production credits.
Thanks for the critique.
PQ




