What a tail. It makes the composition a bit challenging. I might be tempted to crop up from the bottom about 1/2 the way to the 1st spike on the branch.
I assume you used some exposure compensation for this very dark bird against the light sky, or shot in manual?
The blacks actually look a bit washed out, as if you had to recover from underexposure.
I'm not sure I have seen this species before, did you make this in England? The tail really is astounding, makes you wonder how he successfully hunts. Exposure looks good, I only wish for a bit more head turn towards you. I might crop a bit off top and bottom.
You did a great job in exposing those blacks. I agree with the cropping off a bit more from the top and bottom- it certainly isn't an easy image to compose. Not sure if it's caused by the light or sharpening, but I detect a halo. Nice capture.
Stunning bird! I wonder if the image would work better as a vertical. To my eye, the long tail almost suggests it. The BG is even toned enough to add plenty of canvas in almost any direction.