Taken at Myakka State Park in Florida.
100-400mm @ 400mm
Subject dist: 36m
1/1600 sec, f/5.6
Mode: Av
Metering: Evaluative
ISO: 400
AF mode: AI Servo AF
Drive: Continuous
White balance: Auto
A bit tight in the frame up and down. Did you use Shadow/Highlight? There's a slight halo around the bird. You could use the tecnique described here for any local adjustment in plain sky:
Awesome looking bird with a cool title to go with it... If mine, I might consider a more vertical format, cropping some of the sky off the right. I like that you've captured the eye with a catchlight... would try what Fabs is suggesting to see what happens.