interesting photo and technically well accomplished; the exposure, colors, and focus are excellent. I find the grey border a poor choice, though - it distracts from and clashes with the photo.
Very interesting and colorful subject... nice choice. I like your natural framming by the trees on both sides. As you see, the tree on the left incroaches a little but that is the only thing, compositionally I would recommend changing. For non-challenge, personal use, I would just clone the end of that one branch out. I also love the sky color... did you use a circular polarizer? If not, it may have made all these color pop even more.
I like the isolation of your subject and the sharpness and contrast is nice. Not sure if the branches in the foreground really add to the shot. I think the structure is strong enough to stand on it's own as a main subject here