An interesting shot. I think it would have succeeded far better with an ironed sheet - the textures and shadows are really nice. The lighting was well done.
Good shot on the challenge. To make this really have impact, the people need to be completly in shadow. Either a stronger light behind, or perhaps move the sheet/curtain between them and the camera. There's just enough detail that it distracts from the opposites theme. 9
This seems very out of focus and a bit grainy. I'm not sure how you'd fix it, but it's a tiny bit distracting. However, I can tell you put a lot of work into this and it's a great idea for this challenge -7