you have a solid start there, especially on the pipe, but the rest could use some more work imo. I'm mostly missing solid material definition on that concrete, and that electrics box. Riki uses allot of photo sourcing in his texturing, which he pulls of really well, but slapping a concrete photo on a model doesn't make it look like concrete... this is kinda what i see when I'm looking at your piece.
You should ask yourself '
does this really look like concrete, or do i think it looks like concrete', over and over again while texturing.
Also, and AO map wouldn't hurt here i think...
cheers
J