I think I got it. To set this image up, I added the hirez square behind him. The image is plugged into the ambient node and set to 1. On the envirosphere I changed the HSV node to a dark gray to emulate the shadowing effect. Since he's only actually hovering about a foot off the ground, I made the ground plane invisible and rotated the camera to appear to be looking up at him from a good distance. There is a single spot light behind him with a tight beam to add the light from the back. How did I do?

If I had a nickle for ever time a woman told me to get lost, I could buy Manhattan.