Hey, I got a new tablet, and I've decided I should stop stuff shading. I shade by using a 3rd layer in between color and outline, and I just go along the inside of the outline with a color darker/lighter than the color of the second layer. It looks OK, but I want to get a little better. This idea works for more cartoony stuff; like my avatar. But for more serious drawings, it doesn't look very good at all, which is evident in Sheyl.
So how do you guys shade?