First off, I think the bird looks great. Excellent detail in the body and feathers. It does looks like the bird is headed away from you and I would prefer heading toward you. (I know sometimes its not easy. I have more images of the southbound end of northbound birds!) Also if there was just one wish I could have, it would be for a better background... something more natural looking. This looks like painted concrete. Also I am having a tough time looking down at a bird in flight. It just feels awkward to me. Still a very nice image.
Oh and one other thing. It looks more like a Green Heron than a BCNH but I've been known to be wrong... often! And maybe I am here. It could be a juvenile BCNH. I see them all winter but my memory says they are lighter in color.
Sharpness and wing position look very good. The BG makes the bird look a bit crammed in the frame and I would give it more room at the right to fly into. I agree with Ed regarding the bird flying away from you. Keep them coming!