pretty great job, especially the lights and the shadow on the body and the chair. I like the way the black background help to focus on the main subject. The body's proportions are very good. The effect on the floor makes it looks like sand. On the chair, one arm seems to have been eaten, as if the foam was visible. shadows in the back of the woman may be a little too marked but otherwise it looks really good.
Is the green effect on the body wanted ? It's not disturbing, but I wanted to know
Anyway, great work, I wish I can use water colors like you.