Very nice compo and colors, but the bird looks soft to me. Also, the BG could use some noise reduction from using ISO 800.
That lens and tele combination is not always tack sharp.
I agree with Fabs about the slight softness. There also appears to be a green colorcast in the image, particularly noticeable on the whites, and the birds feet. The BG seems a bit oversaturated for my taste.
The perch shows the hand of man a bit more than I would prefer in a perfect world.
The pose itself is very nice with great eye contact, and I like the plants in the foreground.