Photoshop in general or colouring or??
Here's what I came up with anyways:
www.kina-ink.com (She's mah friend! She's got really well done tutorials on colouring with Photoshop.)
https://www.adobe.com/products/tips/photoshop.html
https://www.mccannas.com/pshop/photosh0.htm
https://www.dsigning.com/photoshop/tutorials/
OR you could always head over to your local library and they should have a photoshop tutorial book, which is the best way to do it.
