How I create my grey scale coloring pages

This short video shows how I am shading my line art images to give them a grey scale look. I am drawing on iPad in app Procreate, and with the apple pencil. The video is 2x faster than I normally draw :)

This coloring page is already available in for download in my Etsy shop:
Grey scale:
Line art:
Set of 3 Christmas coloring pages:

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