Today I spent a couple hours on my back porch looking up. In particular, I was looking up at the dormer or eaves above the porch, and at the windows and roof and gutter. The result is still a work in progress, but I'm happy with what I have so far.
Obviously I need to add a sky. Right now the gray background is the unpainted surface of my gray-tinted panel. I'm inclined to add a sky with no trees, to keep the composition clean and simple. I also have to refine the shapes and colors of the architecture. Alas, it's going to rain this weekend, so I may not get back to this for a few days. It's a good start, though!