The photo's contents are really amazing. The color of the sky and tree + the bright blue bird is gorgeous. Don't think I've ever seen that before. The only thing that bothers me, and it bothers me alot, is the GRAIN. And lots of it. I'm guessing you might have sharpened it or put a unsharp mask on it which added to the grain. The good thing is that it is only in the background and that is fixable. Instead of using a grain reducing program, I just take it into gimp or photoshop (I use gimp) and take the blur brush and put it on max blur and go over the background over and over until it is gone, or alot less noticable. If it is still bad, I get the smudge tool out and put it on the minimum setting and go over it more.