Last November I watched this Red-tailed Hawk actively hunting alongside a boardwalk at the Hamilton Botanical Gardens. He (or she) had just launched off the branch at the bottom of the picture
Cleaned up a few stray twigs and small branches
Canon 5D mkii
Canon EF 500mm f4L IS II USM
ISO 250
f/4.0
1/1250
Great image. Totally sharp in the face. I think you can tweak the image in PP and make it look significantly better.
Maybe a bit underexposed as the bird appears to be light from the top or the back, but as i said PP could take care of some of that.