I started by spraying the entire paper with a solution of glycerin and water. Glycerin is the substance in the tube of paint that makes the pigment flow more easily. Adding more glycerin not only allows the pigment to flow more evenly, but as a bonus slows down the drying time.
The extra time allows me to paint more slowly to get the right color and value and keep the edges soft.
Painting the middle ground with hills, a lake, trees and buildings needed to be painted while the sky was still wet because I wanted soft edges. Too wet and I would get no edge, and too dry I would get a hard edge.
Waiting until the surface was a bit dryer, I created the different colors and edges of the varied subjects i.e. hills, trees, lake and buildings.
Note that the bottom of the middle ground area is a hard edge. That will be softened when I next paint the foreground with darker values.