Very nice pose, exposure control and BG. I might put the bird a little bit further to the left in the frame, but not much and crop a bit off the top. I would be tempted to clone out the bright spots on the left, if that is something you do.
The blackbird itself has a very nice pose, good angle to the camera. The perch could be "trimmed" a little bit in Photoshop, and the background could use some help in toning the green a little bit--it's a little light/yellowish for my tastes. Also, watch out for the white highlights coming through the background in a few places. They could easily be quick-masked out (via APTATS)