Hiya echosilver, not sure if it's too late for some feedback?
I like the composition you've got going on here, some heavier break-up of the symmetry could be interesting such as a bounce light on her side or some large rocks that didn't quite get picked up. As the skin blurs the sense of division a bit, you could maybe break up the values with some rim lights as you've done with her right forearm or desaturate the colours and contrast a bit on areas that aren't her face - this'll hopefully keep the definition that her face isn't mistaken for any part of her arm in front. As for the front light, I'd personally try something fairly neutral as to not detract from the nice her and the back-light. You've definitely got something roughed out beautifully though, have you taken this any further? I'd love to see any more progress or experiments on this piece