It has taken me a while to figure out how to approach this left side. Creating a 3-dimensional look on a two-dimensional surface doesn't happen by accident (at least not for me.)
After trying just the darks first, then painting lighter passages, I had a wonderful section of gobbly-gook. It didn't look like much of anything. Pausing, I started to tackle the area again - this time slowing building up the darks, mid-tones, and lights at the same time. I am now pleased with the direction this left side is heading.