Sorry for this comment during voting. I downloaded a script to vote with the keypad and it was not working correctly. I came back to comment on all the shots a screwed up on.
I like the colors of this shot. The shirt matches the sky so perfectly. Great execution of the ROT challenge. The line that the top of the wall and the top of the grass really helps the shot. Possibly a tighter crop to show more of the details in the walker.
The one thing that's definitely on one of the 'third crosshairs' is the man. It also seems that he is irrelevant to the picture as a whole. The way he echoes the sky though, and all the dynamic lines and the colours make for such a great picture that I have to give it at least 7 anyway. :)