In leading a demo for a floating pastel underpainting, I chose the photo of Carolyn, fellow Pastel Society of Virginia member, to use as an example, which was an unusual move for me, as I only paint from my own photos. However, this image was so compelling.
The underpainting didn't cover the entire surface. I mostly worked in darks and greens, saving all the lights for later. This way, the edges I wanted to be sharp and colors deep wouldn't be hazed by floating chalk from the lighter pastels.
Almost entirely done in Pastel Society of Virginia meetings, this painting was so much fun to model and sculpt.
Thor's Hammer, Bryce Canyon, UT