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The artists pastels method looks very cool, and might be worth a try as well. It looks like dry brushing, but using a dabbing motion rather than a brushing motion, and a chopped/cropped back brush. I would think these artists pastels would, if anything, work better with acrylics compared to enamel base coats. I also assume the application of the pastel powder is done dry, not with any water....but how to keep the pastel from blowing away, or worse, smudgng the model