If that bill color is reasonably accurate, it might be the coastal Gambell's race of White-crowned.
I know many of the top photographers on here have a very strong preference for natural perches, but I think the effect you obtained is really different. I find it a lot more interesting than another twig.
Thanks, Paul and Don. Colors here I think reflect what I saw. The guy was on a nice little shrub with a bunch of his friends and, just as I was about to click the shutter, bounced onto the handrail to the observation platform at the pond on the marsh loop.
I think it looks great. Interesting lighting. I normally don't like songbirds photographed facing the camera like that, because it tends to make them look kind of ...awkward. Yours doesn't for some reason.
As others have said, I don't know how you managed the DOF. I have been shooting a lot of White Crowned Sparrows on my property the past couple of weeks, and in shots like yours where the face is "straight on", I always wind up with either the face of the body soft. Did you crop the picture much?