This is a gorgeous pose by one of my favorite models. The photograph from which it was drawn was taken in front of a window that was covered with a white sheet to create rich, diffused light. It's a technique I really, really like, as it creates rich, clear lines and sharp shadows.
The challenge is in the painting. How do you render those sharp, dark images that fade into white?
Here I've chosen to go with lavender with orange skin tones. I like it mostly. The hips and belly knock me out. I've rendered her (gorgeous) face pretty faithfully.