I’m bot completely sure, but since there is minimal shadowing, I would say the technique is contouring
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.............. I would but where I live its midnight already sorry!!
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This was sing by back Street boys
If you're using paper, find the object you want to use for the texture. Put the paper on top of the texture. Whatever media you're using (pencil, charcoal, paint, oil pastels, etc.) lightly brush over the paper with your pencil for example, while your texture is underneath.