So that your drawings don't look flat, sometimes you can add texture.

This is the easiest way to add texture to my drawings.

To give noise for your drawing, select the top option that says FILTER

then select NOISE and you will see this interface, but remember that you must do it on the drawing layer

Choose how much noise you want in your drawing

Making your drawing not have a flat appearance helps make it more pleasing to the eye, for example if you want to place it on your wallpaper on your computer it works a lot!

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And Flat version