Hello everyone! I've got good news!
I made a fully narrated video tutorial not long ago about Photoshop's Cutout Filter: I explain my approach with the tool for Stylized Character Art and projects. So I made this Fire-Ball wielding boy during the tutorial which you can find here on Artstation's Marketplace: https://www.artstation.com/marketplace/p/GobM/character-art-using-cutout-filter-25min-commentary-video
More details on the blog which you can find here: https://www.artstation.com/kyu/blog/WXpG/video-tutorial-25min-commentary-on-character-art-and-using-the-cutout-filter