Thank you for the input. No, in no way I'm hoping for magic, I just want a render that looks "right" to give my customers an "extra plus" before "laying the foundation" (it's my first project and all and I want it to be something special, obviously); beyond that, I'm not really interest in getting the perfect render that could almost pass for a real photo since I start building the bloody thing early next year (which is coming right around the corner, anyway) so...
What I actually meant when I showed the real picture was how to get a "3D look" on reinforced concrete panels (if you see, in my render they look kind of "flat") with the holes and joints and everything.
Ok, so I'll have to make every texture individually and then... see what happens. I'll keep on working and I'll show you later what have I come up with.
Thanks again.