I could say that I'm even more curious to see her front than back, but that
would sound sexist so I won't say that.
Dim lighting shows definition and strength, a wise choice there.
Colors and sharpness of focus are fine. Simple black background;
Nothing to distract our attention from her face and back.
Overall a good composition. An 8
The lighting here is pretty good. There was a photo earlier in the challenge where I commented on being able to see the full outline of the model and you have accomplished this well.