Lovely portrait with terrific raised crest. Sharpness, background, exposure, head angle all look great. I think it could be improved a bit by cropping a bit off the top, and brightening up the bird's iris to give more definition to the eyes.
I really like it! Wonderful and sharp, with lots of details. :) Well done. Agreed about cropping, and depending on how much space you have at your disposal I would crop something like this attached image. :)
I like the head angle, details, BG and of course the raised crest. Another vote for putting the bird higher in the frame and a tad more to the left. I would also desaturate the beak a few points.