Nice colors. A bit too much focus on the less interesting parts (rail, post). I'd like to see what this looks like with the couds in focus and the bird a bit out of focus.
Beautiful shot, meets the challenge well. Two things that I would have changed, first cropped out the sky / clouds in the bottom right corner of the shot and second, this isn't so much a technical deal, more personal, I would have shot at a higher f-stop to get the detail in the sky / clouds. Still a great shot for this challenge, tones are good and composition of the main subject is spot on. Well done.