As the Tiger seems to be the focus of the photo, it should be absolutley sharp.
However I can relate to how difficult that is if this was a self portrait.
Interesting backlighting, but doesn't really explore the spirit of nudity for me in this challenge. Traditionally, nudes are studies in musculature and light and shadow... perhaps if you had used some poses that tightened the back muscles and gone in tighter for more of an abstract with the tiger and the back muscles this would have been a more effective nude study in my eyes. The dof is a bit too shallow here, it would have been better for everything to be in focus. Not sure about the white balance... there is too much of an orange tint to the skin tone.