Dancing at the waterfall

I know that a lot of artists - digital or traditional - tell you to do a thumbnail in preparation of creating an illustration. This means that you have to have a more or less detailed plan of it before you begin the drawing / painting. Well, I hadn't. The only idea which I had in my mind was a certain range of colours - blue, gray, white. While painting the idea of a waterfall began to form itself in my head. Then I knew that I had to do some kind of foreground, and so I went on my way. That is the big advantage of digital painting: You can begin with something and end up with something very different...