Along the right-of-way by The-Egg
Says he, "Train bridge in Binghamton,NY. HDR in photomatix, tweaked in photoshop."
What caught my eye was the clothes and blankets stashed along the side. A most somber image. People live here.
Steve's suggestions on how to leave a good comment...
Tell the artist what caught your eye, something your particularly liked or didn't like.
Tell the artist something you think they could have done differently or better.
Suggest an alternate title; it tells the artist what you saw in the image.
Interact with the artwork, continue its story.
Ask the artist how or why they did something.
If nothing else, even "Ooh, pretty!" or "Oh, ick!" is a lot more information than no comment at all.