Architecture: Three-Storey Residential Building

This is a three-storey residential building that I designed using SketchUp. I have been experimenting with backgrounds on iRender nXt with this render (I used Makati CBD). I also used volumetric fog in two pictures of this render (one night scene and one day scene) to see how it affects the render time (the results are grainy since I couldn't wait for one or two days just for 1000 passes).