Here's an updated ref, because my old one is ew. ;n;
There's only what you see there now as far as edits, but I will add some later. Feel free to comment and suggest any add-ons. :3
Right now the lines are actually a shade of dark brown, I recommend lock-alpha-ing the lines and shading and coloring them so that they look well with your character.
No rules really, just leave my signature and please make sure to credit me if used off site. ^^