To start you off I have included 10 free paint textures that you can use in your illustrations.  These can be downloaded in the Projects and Resources section of this class.

The techniques used in this class can be applied to any style of illustration, so you don’t have to draw exactly like me to have a go!

More info - https://www.skillshare.com/classes/Digital-Illustration-Applying-Handmade-Textures-in-Photoshop/855609946?via=search-layout-grid