Jonathan must say there is not a lot that I would change on this image, bird looks sharp and perched on a interesting piece of rock and I like the blown up feather which adds a little more interest,like it a lot.
Lovely shot of this Turnstone. Great mossy perch, nice background, and I'm glad you got the orange foot. Nice head turn as well. Looks almost like it could have been shot at the Barnegat jetty on this side of the pond.
Nice hunkered-down pose and look back. Excellent blue bg and algae covered rock perch. I'd crop a bit from the top and the left, but comps are so subjective ...