A week ago, after dropping someone to catch the early morning ferry, I grabbed a cup of coffee and wandered down by the harbor. The sun was backlighting the ferry repair yard and the resting boats. If I had had time, it would have made a good painting. As it was, I settled for a quick drawing in which I tried to capture that lighting effect.
Because the 30% marker wasn't quite dark enough to make the buildings and trees on the horizon dark enough, I went over it again and think I got what I wanted.