Handsome bird with nice fluffed up feathers. Nice low shooting angle. Sharp.
He is angled away from us a bit. The bright debris in the water is a bit distracting.
The whites look a bit gray on my monitor, with perhaps a subtle color cast from the water.
I might move him a bit to the right a bit to further decenter him.
I echoe Randy´s suggestions and would add that some selective lightening to the Bg would be great, in order to increase the separation between the bill and BG. Pose is really beautiful :)
I think this is a significant improvement in the whites.
Some would suggest more space below for the 'virtual feet' but that would probably just add in more of the white debris in the water, so I think that change would be a net loss.
Nice image really like the pose, and the action in the shot.
I done some working with the image hope it's allright?:)
I agree with Randy It would be nice with some more room under the feet you done some cropping?