There is a photo semi nude by Oscar Gustave Rejlander of a woman, back turned to the camera called Ariadne. This reminded me of that only because of the placement of the hand on the forehead. You might want to take a look at it. Perhaps it would do nothing for you but in my younger days nude shoots that was basically my style it and seemed to work. I get the feeling you are hiding, what you should be showing. And you are showing what is unnecessary and you should be hiding. Doing so correctly does a couple things.
1. leaves a unknown mystery and deceptive quality making the viewer curious.
2. what is shown adds the mood for the scene. And despite being semi nude the mood isn't always sexual in nature but often adds a unbridled realism.
you can take a very sexual photo , not showing any sexual body parts. And a very unsexual photo showing genitalia. For example: I have a photo I took of a woman years ago, kneeling on a floor looking over the edge of the bed. I left her lower body out of the frame and shot from her shoulder up. But you could tell she was kneeling on the floor because of the bed position. It is a extremely sexual photo, even though it shows nothing of her genitalia. The viewer assume she is wearing no clothes, looks at her expression, the edge of the bed, and the mind roars. Position in a next photo, same woman two feet higher, leaning onto the bed, showing her breasts, makes the photo look awkward as her position is awkward and she appears off balance and uncomfortable. IT loses sexuality showing more. Other thing is camera angle. Two feet higher brings her more in line with the camera, two feet lower puts the camera looking down on her at the edge of a bed. The backdrop is nolonger the edge of the bed.
Don't matter, im just trying to give you my two cents.
what is missing in your photo, is not only did it not pull off the sexual, but it didn't pull off any purpose or curiosity for the viewer. It would be better off a standard portrait photo if you aren't planning on doing more than this with it. Then at least it would make sense.
I am not criticizing too hard, so don't take it that way. I couldn't pull off this portrait either. OR any similar portrait. Not my thing. box portraits aren't my thing.