I put down another dark glaze on the right side of the paper in shadow, then, instead of waiting for the glaze to dry, I painted directly into the wet glaze. This is a nice technique that results in very smooth transitions. It appears that the solid paint is floating in the shadow. It also gives an opportunity to add some subtle colors. I was careful to keep all values very dark, so that they still appear to be in shadow. I think that I will continue to darken this area with glazes after this layer is dry.
I continued work on the paper in the light, adjusting colors and shapes.