Hey man, once you want to continue working in this piece, why don't you rework the pose as some posts suggested here? I think you don't need to change it so much. I really believe that you can achieve a good result if you do it... there are a lot of fantasy works from Julie Bell, Boris Vallejo or Luis Royo that can show you a way to get it. After that, return to rework on the shadows and lights of your piece. I am not a specialist, but I can see you made some mistakes that I also did in the past. For example, the shadows are quite marked in her thighs and between her shoulders and the left breast, that shadows should be softer than it is now.