7 - Good shot. Criticism; whilst no 'expert' in the rule(s), I would like to have seen this using a stricter sense of the rules, especially for the Challenge. A tighter crop, or closer zoom, incorporating more (if possible) of the right of that rusted 'perch', more detail in the feathers, would have made this a better shot in my opinion. Like the colors and the background, just more definition on the bird, as you have in the 'perch'.
I really like this picture and the fact that you have multi-tones of green in the background, not flat black or white. I love the contrast of the rusty metal with the bird's coloring. Minor quibble, to slavishly follow the Rule of Thirds, I think you should have shifted the bird and his perch over, up, and to the left. I think it would balance the picture better, but now that I look at the picture again, maybe not.