The lighting doesn't look overly complex to me. Mainly I see what looks like a large softbox to camera right, and a hairlight to camera left. I mocked it up using the virtual lighting studio here:
The background gradient could be achieved in a lot of different ways, but likely is just from adding a gel to a strobe. It could just as easily be achieved in Photoshop though.
Post processing of this image - I would have to ask what in particular you are interested in learning about, as I don't see any technique that really stands out.
The real beauty of this image is the "mud" on the model.