I like the bird on the rocks. Makes for a nicely composed shot. Also like very much how it is cropped. I think your bird would benefit from a little more sharpening. Agree with Colin about the feet. Also think the shot has a bit of a blue cast to it. Is this a Gambells? We only get this supspecies as vagrants in the East.
Handsome fella (my favorite species of sparrow). I like the profile pose and the perch. Too bad it did not opt to perch at the very top of the rock, and although I'm sometimes OK with a dirty bill here I would have preferred a clean one (out of your control, I know).