I don´t know what filter or effect you used to get that contrasty gloss effect but it´s not really working for me at all, sorry. Other than that it looks like a nice shot, I would have tried to get all of them in the shot though, the guy on the far left has a steel bar over his face.
I really enjoy the interaction you got from your models and think the human element in this submission sets it apart and above many others in this particular challenge. Regrettably, from a technical perspective, it seems oversharpened.
This physically hurts my eyes to look at. Possibly it was over-sharpened, or maybe its been cropped alot, i'm not sure about that. I am sure that having more focus and detail in the re-bar would make for a much better picture.
The rough, unfinished look suits the subject perfectly. Although many won't, here is one who "got it." Looks like a Norman Rockwell painting. This BG is a bit cluttered, but I know, that is how a construction site is.