Terry,

Greg's answer is in his Avatar.

There are some pages where people have done picture tests that are helpful, which is probably what you are looking for (people in natural environments at a distance).
I'm surprised that ASAT, Predator, Enigma, don't have more of these pictures. I always see the same old pictures on the internet. It doesn't seem like it would be hard to get a camera, take some good pictures, and post them on the net. Good pictures demonstrating how game would see people up in a treestand or on the ground at a distance will do a lot to sell their product, b/c the open patterns aren't that great looking up close.