Glazing for layers.

In this painting, which I did on the side of a New Hampshire roadway,  I considered what the procedure would have to be.  There are only three things that can change in any one shape:  value, color, and texture.  Light to dark values:  sky, far distant mountains overlapped by progressively darker values as I moved forward with each plane.  Colors:  cooler to warmer in the foreground.
Textures:  Smoother shapes in the background to more rough textures and edges in the foreground.

Plan for a few minutes thinking about these three things.  Then you can paint rather quickly and keep your glazes fresh and clean.