I like how the railing provides leading lines to draw the eye toward him. I might crop in a little bit from the left though. There's a lot of unused space that minimizes the focus on the subject. And there's a tree growing out of the top of him, but that's not a glaring detail.
There's not much else I can say about the photo. I'm curious as to what he's photographing lol
I agree about the cropping the left side. Perhaps just short of the first post. The second thing, and I feel is the most important is that what was needed is a polarizer lens, For two things: 1 to get rid of the specular highlights on the foliage, and 2 to deepen the saturation.