You can paint toon lines with certain attributes—Line Width, Line Offset, Line Opacity, Profile Color, Crease Color, and Border Color. By painting your own toon lines, you can control the look of toon lines in specific places.
Click the line itself, or click a surface if that surface has only one toon line on it.
The 3D Paint Tool Settings editor appears. If you don’t see it, click on the Show or hide the Tool Settings icon in the upper right of the Maya window.