A male mallard duck creates high frequency ripples in the water with its bill. The back lighting makes the water bright and allows the iridescent colors on the head to show.
I used the rule of thirds for this image. The frame border remain clean with the water-framed duck positioned about 1/3 into the frame and facing toward the 2/3 remainder of the frame.
Camera and Lens Settings
600mm f/8.0 1/320s ISO 500 5760 x 3840px