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I just had a look at the tutorial and they do shade both the yellow and the green using Agrax Earthshade. It is a bit more subtle on the green than the tan, but it's definitely there in the tutorial. If you do that and find it's not dark enough, since the tutorial paints the green first, one thing you can do is paint the green then before painting the tan, hit the crevices of the green with a dark brown or black wash, then when you do the tan and do the crevice highlighting, the green will effectively end up with 2 layers of the shading, making it a bit more pronounced.
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