Unifying Shadow Shapes

The goal is to keep the shadow together as one shape. The edge of the shadow is cool on the upper right, where it picks up the color of the sky.

Rabat, Malta, watercolor. 

The shaded buildings on the left are warm where they receive reflected light from the warm illuminated buildings.

But compared to the light tones in the distance, the shadow is one basic tone, and I try to downplay the detail in the doorways and windows in the shadow area to keep it simple.