As much as I like to work outdoors, rainy weather sometimes forces me in to work from photos. This is one example. The photo has less color but just as much dark as shown in the painting. Although experience tells me that, in real life, the shadows would not be so dark, I kept them that way. I wanted to "punch up" the difference between the rim light on the boats and the background behind them. The effect of strong morning sun is a key element.
Also, in the photo, there was a good deal going on behind the boats. I may have taken the photo at the height of lobster season, when the docks are full of fishermen hauling out their catch. I wanted to simplify all that. So, although you get a sense of visual activity because of the broken, uneven strokes, you aren't distracted by it.