Thanks for the comments guys and gals!
They are all taken much into appreciation.
I had one day to do this image, the model was mostly done for me in CAD (just an import and cleanup in SU) I think it may have taken me 6 hours start to finish? (this is mostly Photoshop) also due to the time constraint, that is why there is no detail to the materials on the building. I needed the render in a matter of minutes, so kept the KT work to a minimum.
regarding the trees... I got in trouble for this one. There are actually no trees on site. There is nothing there but concrete and an oil refinery, but I thought I would slip those in and try to get away with that, because I find landscaping much easier on the eyes than dump trucks the size of houses filled with oilsand...
anyways, thank you everyone!