I like this. It is an elegant pose with a lovely model. No foreshortening or unaccounted for limbs/digits, which are common in too many "artistic" poses. The lighting is spot on. I really like the interaction between the foreground (her and her clothing) and the background (what she is laying on.)
My only issues are the loss of focus as it moves latterally from center, and the twist at her midsection. She is thin enough that her waistline looks malformed with the twist she is currently in. Something as simple as moving the top leg behind the bottom leg, instead of how it is, would open her hips slightly and would decrase/lower the twist from uo near her ribs to closer to her hips. It would look more natural and would reduce the deformation at her waist.