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ANSWER TO MYSTERY TECHNIQUE #148:
I started by using a ratty brush to create the first layer of the background foliage. Next I painted the ground with a wet-in-wet mixture of 2 granulating greens and yellow, then lifted out the roots with a damp sponge. After this dried, I painted the roots wet-in-wet and used the end of a metal paint tube to scratch linear patterns for the bark before sprinkling in kosher salt for more texture.
I let this layer dry, then brushed off the salt and added 2 more layers to the foliage before finishing the ground. Working on dry paper, I used a modified fan brush and a piece of non-slip shelf liner to add more texture and kept the color out of the roots with pieces of torn paper. I also darkened a few places with watercolor pencils.