Thanks again for the suggestions. Raymond is correct, that is not noise but OOF beach sand. I took this from the surf and used that natural color beach sand as the BG. There is a progression from totally wet (reflects the blue sky) to partially wet (looks splotchy - partially blue, partially tan) to dry (solid tan). I was already below the bird, but I guess even lower would have gotten more of the solid color. Also more wide open would have helped, I guess.