Although I do not really care for this kind of art, she does have a wonderful body, and the lighting is nice. Also, I viewed her used it as womanly bodies anatomy practice, which actually came out quite well! ^ ^
It has the most common mistake on nude photography: Underwear marks. It's hard not to make that mistake, because she should have been naked for a long time before taking the shot to avoid that mark, and I suppose you can't just say to the model "hey, take off your clothes and let's wait for a couple of hours".
Beautiful shot, though. Green background and red hair make a nice colour palette.
So fuckin good!!! I like the sun lighting, nonetheless I'd kick some soft-box flash from the left side to sliiiiiiiiightly kill the shadowy area... coz that's a beautiful shadow there, but wont hurt to reduce it. I believe you've done that before, but because I haven't had such a model so I'm just thinking loud...