I like the choice to go black and white here, given how busy the foreground is; the eyes have nowhere to rest, and I suspect color would only have emphasized that.
B&W works well for this, but it is a bit soft for such a stark subject; some sharpening would bring out some of the details and better suit the subject.
Nice factory shot but for this challenge maybe you could have focused more on one part of it, conveying the clutter and grittiness of the area? The contrasting is good though I probably would have scored a little higher if slightly brighter.