That's hilarious. You "fake" the blue pencil effect. Maybe I am the only one left in the world. I still use non-photo blue pencils to sketch cartoons/graphics, then ink with an art pen before scanning into Photoshop.I turn them blue in PS.
It's easier to see the pen tool and render over it for me.
I have a tutorial kinda thing for how I make these....hold on.
There's a thousand ways to do everything in PS so it's just how I was doing it back then. I have no clue what I do now.