Did you edit the background much?
only with that look from the bird ( great look captured) and that dark (almost stormy) background you have a fantastic shot there!
hmm maybe a blur tool or something along the edges of the bird then?
his head looks fine - but along his wings back and chest (the browner areas mostly) the change from fore to background looks a little "artifical sharp" to my eye
course you might be wanting the look that you have - either way its a cracker of a pose from the bird