Wish I had opened up the aperture a bit -- this guy was too fast for me. Also the oblique branch above and to the swallow's left would be better-off gone ...
A magnificent shot, truly a great pose. I would try to clone out the BG branches to the left / behind , but really, for me this one stands on its own in any case.
Ian, I like the DOF the way it is. If you had opened up, then the perch branch would have gone out of DOF range in the lower right area. Terrific moment. And excellent positioning to keep area behind the head clean. I don't mind anything in the BG. the branches are OOF enough not to hurt the image. Composition is superb as well.