Drawn from a strange little photo I found on Pinterest. Is it a caveman or Uncle Fester's brother? Anyway, it is black and white Prismacolor pencils, some black Prismacolor watercolor pencil, some white gouache, and just a bit of post processing in Photoshop to add some splatter. The paper is some generic scrapbook card stock that I got on sale at Michael's.
It was a fun draw done in the evening when things slow down. Took about an hour or so.