A Beauty, Karl.
Whites look great and you got some detail on the black head which is tough to do.
There is a bit of halo or ghosting on the far wing, should be an easy fix.
Nice flight pose. the catch eye looks a bit dim to me. On my monitor, the near wing looks great, but I don't see much details on the leading edge of the far wing and on the fish. You may want to check the exposure there. Loi
Magnificent flight shot with fish in the beak. I like the details in whites,nice BG and composition.
Little bit sharpening will not harm the beautiful of image.