When I look at a picture, the most interesting part is how it makes me feel followed by the admiration of the artistry within the scene.
What I feel when I look at this one is a sense of curiosity, it's easy to assume that we've an explorer/adventurer on our hands. I feel the intentions of this fine explorer are a bit more than just breaking a few rules, to me, he seems that he's up to something. He has a look of worry, perhaps a need to remain unseen for the actions to follow. He feels cozy however, I think he'd be very easy to hug as a friend or a lover, he kinda gives off that feeling that is just easy to love.
The scene it self is very well done. Not just from a drawing point of view, but from a structural one, it would seem some research was done prior to the commissioning of this fine piece of work. I mean the main rails, support struts, cross members, all the parts of the bridge seem to make sense along with the location of the rivets. I would even venture to say that perhaps you've adventured on some bridges yourself (which is very fun). Very subtle to place your title as an engraving on the steel I-beams. The depth is well thought out, really feels like your actually under that bridge. I can see you understand lighting well going by how the light rays shine through the bridge onto your character from the low sunset.
MY final thought, this is a very well thought out scene that can create many stories. The anatomy of this character makes very good sense and the scene more realistic. You are very good at thinking out the details and making them visual. This is something I would be happy to frame in a main room since it creates it's own stories. Wonderful piece of mastery you have here, I like your mind.