set the layer to clipping, if your art program doesn't have it then just erase everything around the lineart
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this is what your drawing should look similar to,
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after that, set a new layer to multiply and use a gradient to fill in your drawing with another purple/gray color
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add another layer and set it to overlay, using the gradient tool fill in the area where the light hits
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2 (shading/lighting)
Start from the beginning
