The koi adds an unusual touch of color to an osprey image!
Sharp, exposure looks good with possible exception of whites on neck. I am on work computer, it tends to show whites too hot.
It's been my pleasure to lend a hand Haim, both in Israel and online. I'm happy to see that you're finally starting to feel comfortable with the Mark IV. Definitely a different kind of fish than I'm used to seeing; very cool! Great sharpness and a nice exposure. A slight head turn would have been nice, but still a very good image!