Firstly, this looks amazing and far better than what I can do. So I'm not sure what you'd want critique on specifically.
But I did notice the shoulder coming towards the viewer; the crack along the ground that provides illumination looks like it runs a lot further by it coming out of frame. But that lower bit of their deltoid looks as dark as the shadow on their back, which doesn't quite make sense as it's facing the length. I figured it was darker because of the strips but without the other shoulder to compare, I think it may work better to make the strip on the shoulder (if there is one) more defined, or to add more reflected lighting on the dark purple, especially the plane of the shoulder facing the ground and upping the contrast between that and the upper curve of the rounder deltoid muscle.