Desert Landscape Shadows
Create your rocks and ground with warm colors. To begin, paint the "middle color" of your rocks (not the darkest or lightest value).
For my rocks, I used Burnt Sienna and added a little Red and Raw Sienna to make it even warmer. This was my base rock color. I added blue to this to create the shadow color (blue is the compliment to orange).
Use the shadow color to lay out the edges of your rocks and start giving them shape and dimension!