lance took care of the tech side. i'll hit a couple of points and let others chime in. first off is the setting. i'd love to see the bird in a more natural setting. the second is that when you include as much habitat as you have here you want the bird to be in a corner of the frame close to one of the intersecting lines of the rule of thirds. i can think of a few more things, but i'll see what others have to say. keep em coming!!
Oh, I like it. I agree with Lance about the ISO. Just for more fun, I would crop it more pano and, more important, play with the light. More on the bird and the ground he stands on, decreasing in background an foreground.
Plus, I like him standing out on a deserted road, all by his lonesome, gazing into the distance and wrapped in his thoughts.
Hi Jay, David's repost is a lot better than the OP, but I agree with Al that there's still too much space behind the bird; maybe there's too much space in front as well. In other words, I would try a vertical composition.
Regarding ISO, as Lance says don't be afraid to bump it up to 1600 or higher. I have images with my D3S at 3200 with no discernible noise. To get an idea at how well the D3S handles noise at high ISOs, you may wish to see the image I posted today of a pelican, taken at ISO 1600.