I wish his head was a bit more distinct and the crop wasn't as tight. However given the difficult subject, I love that you caught him in motion, it's a very interesting picture.
I would have liked more focus. But I know you don't get many chances at a shot like this, and it's tough to focus on a moving object, especially if it's about to come and violently take your camera.
This is a magnificant shot! How you got your camera positioned just right to get his midsection and head in focus is beyond me. Even though it's just a tad blurry, it's forgiven in this instance. The lighting on him is perfect. I don't know if you noticed it before you submitted, but there is a sliver of picture missing in the top right portion.
Wow!! Nice capture. Almost in focus! Even so, you can still see the expression of this magnificant bird as he's hunting. Lighting couldn't have been more perfect. I'm quite impressed.