Note: Have her Push the face into the arm pit to avoid the head looking like it is falling off, and save some retouching on the neck.
Sheets, fo fur and I was so excited about a shot I even used the drapes you can see that image in the Artistic Nudes gallery are all a great way to get photographs of implied and partial nudity she still feels comfortable because she controls how much shows and it works for all body styles.
Shooting with the back and a little of the butt showing is a direct copy of a Greek goddess, get her to look away from the camera and bring the chin down, then over the next few shots bring her back to looking at the camera.
Just a white towel this is also part of a white sheet session
A different color sheet makes a totally different looking picture, Glamour shots with a red sheet standing, shoot from the front to the back