I like the dangling legs, gliding pose, look of concentration. Soft background.
It seems a bit contrasty to my eyes. Did you need to do any pupil work on the eye?
I might consider placing the bird a bit higher in the frame.
Pose and BG look very nice. I agree with Randy that more room at the bottom would make it even stronger. If it is not a heavy crop, I might sharpen the bird some more.
Agree with the guys above that it is a very contrasty image. THis could be caused by a heavy crop or post-processing. Either way, softening the contrast and placing the bird higher in the frame will help. TFS.