Quote Originally Posted by mmmmmpig View Post
that is a very similar technique to what comic book colorists use. You create a layer for the inks, a layer for the flats (flat colors) a layer for shadows, a layer for highlights, and a layer for effects. Works pretty well
That's actually where I picked it up.

There are some good techniques in "The DC Comic's Guide to Coloring and Lettering Comics" Watson-Guptill Publications 2004.