Yellow-rumped Warbler

The angle this shot was taken at is extreme enough to be clearly intentional, but not enough to be considered overly dramatic. The depth of field creates a backdrop that almost looks like oil on canvas, and ensures that there is nothing in the frame that was not entirely meant to be there. The rule of thirds is vertically adhered to, (particularly in the sense that the bird's head lines up perfectly with the height of the plants) but not horizontally, although I think I actually prefer it that way.
The only downsides are that, likely due to the wind, the stalks (particularly on the left) are just the slightest bit blurred. Hardly even noticeable, but enough to detract from perfection. The other is not the fault of the photographer, but were the post not covered in moss, it would be a shade of brown that would entirely fit with the color scheme of the picture. As it stands, the green doesn't fit as well as everything else, but it's subtle enough so as not to make a huge impact.