Hey y'all :)
So, shading black or white can be a real pain, right? Well, I own and have worked on quite a few of these and am here to provide some insight. Please note that any brush/tool suggestions/assumptions are from the latest version of Gimp. If you work in Photoshop, sorry, but I have no idea what it's got. You can follow the other color guides, though :) Huh, this is kinda turning out to be an all-around shading tutorial (was originally going to just be about black and white)... If you want more, let me know :)
Black and White:1. Never start with pure black (#00000) or pure white (#FFFFF).
These are impossible to darken or lighten,