Step Seven ...
Another 'undercoat' block - almost the same as the one used in Step 4, but minus a few things up on the roof, with some random cuts on the ground in front of the building, and of course, without the pathway area at lower left.
I mentioned that the pathway - even though it was a smear of dirty grey - would later appear bright in the moonlight, and here we can see the start of that transformation. There are many more impressions still to come in that area, but you can see how the process works ... surrounding a dark area with things even darker makes it seem light. And when the surround becomes really dark, it will seem very light!