Jim:
Dynamic pose, spread wings, open bill, like the angle of the bird in the frame.
The whites of the bird are sig. underexposed. Always a challenge to meter against a backlit image like this. Because there is so much action usually at the rookery, try and do a few test shots as you go along to be sure the subject is going to be as well exposed as possible. Shooting in manual exposure mode can work well there. I know, things change fast, so that strategy doesn't always work, but it can be very helpful.
The bulk of the birds body seems a bit too centered in the frame, although the head is on the right rule of thirds line. I might try some different crops, starting with a bit off the left.
Cheers
Randy
