#than going

I’m trying to find a youtube tutorial on a very specific coloring thing and its so uuhhhh I dunno? not what people would normally make tutorials about so I don’t know how to word it to even find it?

Anyway if anyone knows stuff about coloring and can help me word this thing in my head so that I can find a tutorial on it, please message me! I’m confusing myself so much! But I have a very specific example in mind that I can point at and be like “I want to know how to do this thank you”