My process has evolved into applying a watercolor underpainting of mingled colors onto sanded paper. When dry applying pastel to finish.
Dry pastels are used from hard to velvety soft, each making their own marks and quality of color. The underpainting appears as drips and glazes of transparent colors against the opaque pastels on the top layers.
The underpainting interplays with the pastel and is visible in the final painting to add layers of depth and mystery to the scene.
These images are of the watercolor underpainting and are followed by stages of pastel application until the finished painting image.