Shade the layers in order from the bottom. I'll demonstrate with the right shoulder, since it's easy to understand.After shading with brush pressure using the color shown in (1), add dark shadows with color (2). Adjust the shape of the shadows with the base color (the color in the lightest parts). Paint the other layers using the same process.brush→hard circle brushbrush tablet options→check "opacity"brush options→interval all the way to the left, fade all the way to the right. (If the interval settings aren't right, the brush will shake easily.)