>>1818627I just color inside the lines on the Coloring layer with the Paintbrush tool. The size you should use will depend on where you're coloring, and I kept the hardness at 75% and left it at Anti-Aliased... and didn't touch anything else. The size was really the only thing I changed. If some of the colors became difficult to see while coloring, I changed the Background color to something more helpful. (In the case of
>>1818513 I used an Orange as the original Background color before changing it to Black. Everything popped very well.)
I apologize if that wasn't what you asked for; feel free to ask for anything else.
>>1818652My secret is that I can't shade at all, so I have no advice on this front either. Flat coloring is the best, to me.