During the 1970s. The exact date was August 9, 1974.
You basically make up your own creative but effective way to create the scene. (with the rain)
A-la-mode and rake's process
Well we have a lot of symbolist painters..
Gustav Klimt
Edward Munch
Frida Kahlo
A lot of painters..
hope my answer helped
You would want to mix he dark one first so that you can slowly put lighter color I'm so you know how much to put in