Nice idea. The shape of the bird is clever. Overall, I think there's too much in the photo - particularly the outline of what looks like an A frame that you seem to be holding up. I seems too busy, IMHO.
I find the background a bit too busy for me to focus on the shadow. I don't think it was a bad idea but it doesn't seem to work. I'm guessing it's the grass along with the shadows. Just too busy.