i created this primarily for myself, but others may find it useful! please see instructions for details. PM for questions.
the character depicted is my OC.
there are 2 sections. first section = drawing in order to shade



select your drawing, make sure it is a single layer. there is an option for color match as well.

you can highlight as well. be sure to select your drawing layer.

section 2 = erasing in order to shade. it is the same process with transparent brush or eraser.

the colors can be adjusted.