More style tests (and Ripple Cracker Volley)

I figured I might try doing some stuff with just one colour, and some quick work later this is the result.
I didn't really use that much reference material for the skull which is why it's about as anatomically correct as a western 14 year old's attempt at a manga character.  

As for this, having some other ideas I wanted to try out and figuring I might as well make something for Joseph Joestar now that the anime has reached the second arc (and with no pencil sketch, which explains one or two things about the face amongst other things), so there you go.