Test to see how the white wall reacts to color correction. We think that we may need to add an bit of gray to the wall to reduce blow out and darken the image overall. Both of these images have a 50% gray layer added to them.
Test to see how the shadows fall as if there were a head through the hole.
The diffusion is created by taking vellum, normally used for drafting, and double folding it. The lighting is top lit using a 2k.