We all know I love Edward Hopper - or you don't. His most famous painting in American Gothic. I would show. it, but everyone and their sister have seen it. And I don't like it. (It is at the bottom.)
There is a show in Gloucester Mass that showcases Hopper and his rare watercolors of the area. Apparently he meet his partner/wife (I don't think they actually married) who helped him develop his distinctive style. Here is the web site if you happen to be in Boston in the next months.
Some examples from the show:
Above are two of his more distinctive and recognizable paintings in oil with his style