Here's a Cactus Wren perched on - well - whatcha expect!? The image was taken in the last light of the evening just before sunset. My mind still isn't made up on colour temperature - too warm?
Canon 5DII -- Canon 800mm f/5.6L IS -- 1/500s @ f/6.3 -- ISO640 -- 0 EV -- Fill Flash @ -2 2/3EV
Very lovely light and you captured a nice pose/HA. The background compliments the image nicely. I agree with Randy, I think it's a little tight in the frame and would add a bit to the top and right but, of course, cropping is always so subjective.
That's a lot of bird in the frame. Have you cropped this image? Maybe try some looser comps if you have and see how you like it. Everything else looks superb to me and I really like the clear eye and interesting perch.