I love the composition of this one, it makes me feel like the bird is acutely aware, and ready to make haste in a moments notice.
C&C, as per your request: I, personally don't think the grain adds to this photo. I doesn't make it appealing to me. Looking at your EXIF data, you had your ISO WAY up there, giving you a light speed shutter speed of 1/1000 sec. In a scene like this, you could probably have reduced your ISO by more than half, which would bring your shutter speed down, as well, but more importantly, eliminating much of that grain, caused by digital noise. This could also be removed in Post, but it's always better to prevent it first. I Would think you could have reduced you ISO to 200, or what ever the lowest native setting is, and still had a shutter speed at or near 1/200 sec, which would have likely stopped any motion blur, and not captured the noise. I also felt a tighter crop was in order. See below..
I saw your photos were ok to edit, so I hope it was ok that I took a stab at it, if not, I can take it down. Even though I had a small file to start with, I still made some ok changes. I cropped some of the image out, to put the bird more on a third. In this case he crosses the top horizontal third and right vertical third. I feel like this edit makes the bird pop a little more, yet still keeping some of the context with the background. Though, the beauty is often in the eye of the beholder! Feel free to not like my edit!