IMHO as presented it needs more space top and bottom - feels too tight. Also think you could sharpen the bird a tad and desatuarte the blues a little. A bit of a head turn towards the camera would have been good.
I agree with the above comments for the most part. It is a bit tight on the top and the blues seem too blue. But you nailed the whites. Good details. I have always thought reflective light patches on the body add to the image. Nice water drop and open beak.