I found a cute house on Google Street View in Bremmerton, and did a little value study in ink. It was boring. So then I did an image where only the shadows were blocked in, followed by doing it again looking only at the paper and not the reference, caring more about the balance of darks than whether it looked like a house. Finally I loaded the image onto the computer and added some highlights, color, and house-ish details. It was a lot more fun this way, at least.