Firstly, let me start off by saying. The image isn't bad.
Now, let's get to the crit. I have to say, all of my crit has to do with the items in the image that have nothing to do with the design. This can be seen as both a good thing, and a very bad thing. Yes, your design looks nice, the perspective matches your sky and for the most part, the composition is decent. (although, I would say you have a little too much foreground for the rule of thirds) What is wrong? your RPC's detract from the image in every sense of the word. The vehicle, people...plants. Everything seems "hell-bent" on ruining the building you have modeled. I may seem to be a bit brash on this, but I would say if you integrated the comp layers a little better into the image it would REALLY work!
Finally, and this is a very last and somewhat minor annoyance, the black border is not even around the image. It isn't huge, but it does give a VERY strange "aspect" to the image.
These critiques honestly could be fixed with a little level balancing and or some overlays in photoshop to help "integrate" your entorage with your rendered geometry.
Keep working at it, you will get it. Sorry to be so harsh.