The final version, but I really could tweak this forever.

Fourth Version. I wasn't happy with the values and colors, so I really changed them here and added some movement.

Getting the main elements in. I wasn't happy with it at this stage, the colors were too washed out and there wasn't the sense of distance and height that I wanted.

Changed up that building on the left to better fit in with the rest of the composition.

Basic detail on the main structures to get the lighting and value scheme in place.

I started in Sketchup and took this screenshot when I was happy with the composition and angle.