Burns

I’m going to use Overlay for this example.

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With the shell layer selected, Layer > Add Layer Mask > Reveal All. Take a black brush and paint over the areas where you dont want the texture (over the white space, basically – though not very important here, it would be if you had a complex background)

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Some brightness/contrast tweaks, Dodge & Burn if you want to create dark and light areas to accentuate the texture.

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Also in the Photoshop Tutorials category