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When I work digitally I use dark and light scratches on my image many times.
For Photoshop layer, I use cardboard in Multiply mode and dirty paper in Linear Doddge mode. :)Thank you @donnadavisart ! :)

I do digital now, but mostly use oil, oil pastel, chalk and ink. I have not experimented with layers for paper yet. As you said this it made me think how easily I could be doing a sort of printmaking digitally as well. Thanks.

Great! I love the manual work. I draw many times manually, but also digitally. :)