|This B&W in color challenge would be a rather tough one. I thought about entering it, but everything around here and out doors where I like to shoot has a lot of color in it.
This image is a good find, to get the light thru the pipes the way you did, and the shapes and lines are good too. I think that it got voted down in the challenge because there is a lot of noise in the darker areas, and, for this challenge, something with high contrast on very strong lines would have been better.
The general low key (not bright) effect keeps the image from getting a lot of views from the thumbnail, because it is difficult to see what it is in thumbnail size.