One of the wonderful characteristics about watercolor is its ability to appear luminous. Because watercolor is a transparent medium, the colors that are put on the surface first will influence the following layers. I consider yellow to be one of these "foundation" colors. If I want a finished area to have a warm glow, I will first put down a layer of yellow. Much of the "yellow" in this painting, for example, is foundation for what will be rich, warm, luminous dark spaces.
I have covered most of the surface with the first steps in describing the textures, shapes, and forms. Now I will begin to "push and pull" shapes building up the darker transparent layers and developing depth in the painting.