Striking lighting, very eye catching. Clean background highlights the subject and nest well.
The yellows on the breast don't show a lot of detail. The eye/head could stand a bit more sharpening.
I might be tempted to try a version with the bird moved to the right a bit so it isn't so centered, but the balance is interesting as is.
The yellow on this one is quite difficult on a computer monitor to get all the detail to show, but i seen it printed in a book and there was more detail than i thought it would produce, could just be my crappy processing!!
Cool setting and pose, you could try to selectively desaturate the yellows a few points and maybe sharpen the head a bit more. I like the composition as presented.