Let’s look at the renderings first:
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Create a new background layer and fill it with gray, create a new layer, use the pen tool to outline the hairline, fill it with the hair background color, and make it feathery.
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Customize the brush, draw the hair in two layers, use the smudge tool to apply, deepen and dodge to draw light and shade. Add shading separately.
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Create several new layers and use the same method to draw branched hair respectively, darken and dodge.
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Use the pen tool to draw the direction of the hair and stroke it.
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Finally, use the smudge tool to modify and merge the layers. Completed.
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