I also see what look like a few cloning marks just grazing the bark. Tremendous pose, this guy looks huge, and the split second timing of the landing is very cool.
I really like the wing position and the fabulous feather detail. The perch shape compliments the wing and body position well. It does have a bit of a halo. I also would fix the left hand edge of the perch to make it look sharper. The fuzzy edge detracts from the rest of the image as the rest is so sharp.
Thanks everyone for your suggestions and kind words.
The part of the perch that looks cloned / fuzzy is a result of me quickly using the blur tool to get rid of some artifacts when I resized it for here. I hadn't noticed it until I posted and was too lazy to redo it.