My process is below for those interested.
1. I used a Shock Yellow Light Montana Marker to color the entire page.
4. I switched to Sharpie brush point markers at this time. I used purple to color in the shadowed sides of the building, leaving yellow squares to represent windows.
5. I used Burgundy for the front of the buildings, again leaving squares for the windows, and then added Dark Blue to the center of the shadowed sides.
6-finish. At this point I was flipping back and forth through colors so often that I couldn't really photograph every step. I used a fluorescent green Sharpie (regular tip) to shadow the windows and roofs, and a darker green for the grass. I squirkled (a kind of scribbling to add texture) some purple along the right side of the building fronts using a Hi-Tec-C Maica Gel pen.
I used the purple and dark blue Sharpies to add the shadows and blended into the grass. The scan didn't pick up all the color, and on the actual page the shadows and hillside are more thoroughly blended together.
The buildings in the background were added with the purple and green Sharpies.