If there is what Pangor said I would have to agree. Either light or somehow, from what I can tell, your ground texture got attached to a light, or your camera as a gel....But as I only use
Poser PP I know not of the nodes.
I also agree with Torme, it is a nice effect and would only be a better render if it where a little less obvious.
Torme, don't waste to much time on the manual. It isn't that great a read!