11 Bring in a secondary light source
Now I’ll use the cigar as a secondary light source to give the scene even more depth and drama. I add a new layer just below the line art layer and set it to Normal. Then holding Cmd (Mac) or Ctrl (PC) I click the Cel Shading layer. This selects only the shadows on the character. Now I use a small airbrush at low Opacity to add an orange glow to areas reflecting the cigar light.