SeaFoam Tutorial for Photoshop by mindsend.deviantart.com
The starting comparison is wrong. Cartooning is an exaggeration or simplification of reality. I feel posts like this are great for self reference and improvement, but in a year you'll look back and see how naive you were.
Just found this beautiful tutorial. It mentions things we often don't think about, like the texture of skin, and is based around the digital medium.
How I Draw Male Torso by nursury0
Creating smoke in Photoshop by chewymonkey.deviantart.com on @deviantART
Mini-Tutorial No.2 - Basic Water- by ValaSedai on deviantART
Tutorial: Tree (Updated) by ichan-desu.deviantart.com on @deviantART
How to do shadows, 3-d form poster. great for teaching value and shading geometric forms in art lessons
Sketching to Painting
Texture Tuesday: Leather Tutorial by JakkalWolf
Drawings Lights Concept More
Colour and Contrast by uchuubranko.deviantart.com on @DeviantArt