Odalisque!
This was shot during a lingerie and nude photo shoot with the model and got lucky with the awesome curtain available.
This was shot with the Canon 5Dmk3 camera and the 24-105mm f4 IS lens as well as using natural sunlight coming from the window on the right of the photo, to the model's left.
Her sitting position is natural as she is sitting on a mini fridge in the room.
The photo was edited slightly in Photoshop to make the colors more muted.
Thanks!