Nice pose and HA on this duck shot. I like the colors and even though the BG is busy, its a natural one for waterfowl. Is it a large crop? It looks pretty noisy for ISO 400. Well done catching him in flight.
Beautiful image of the American Wigeon. The concerns expressed about noise appear in the secondary feathers primarily. Perhaps this can be addressed in your workflow, while the 7D as I recall in my research of the camera offers a challenge with noise reduction and sharpness.