Very nice photo. I like the light, color, wing position, and background. The bird's body is angled slightly toward you which is a plus. Maybe a little more room on the left for my taste.
Ok this makes me hate you SOOOO MUCH! I have tried toe get shots of these birds for ages now, and not only did you get a shot, this is perfect! Well done!
You overcame a huge challenge to virtually stop action at 1/800 at 1560 mm. And ducks fly fast so how you managed to get a shot off at this focal length is beyond me!