Attached Link: http://market.renderosity.com/mod/forumpro/showthread.php?thread_id=2662390

You might want to check out that thread. I posted several links about lighting and shadows and I believe there was one or two about making your image look like it belongs in the background.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi