This drawing was made on a school chair some years ago, during a boring class :D. My cellphone camera wasn't that great (easy to notice). I used it as a initial drawing and started working on illustrator.

On this zoomed crop, you can see i used different custom brushes on illustrator, to look like coal, ink and pencil. I added some little ink drops all over. I used some red to break the black and white pattern, iy could be ideas flowing, troubles warning or even blood!