Some ink, colored pencil, and graphite put together for fun practice... also, little shark! ^^ Spiny Dogfish are common and docile critters, eating mostly crustaceans and rarely getting up to 3 feet in length. With a large and well-enough aerated saltwater tank, they can make lovely pets for advanced fish keepers. ^^' Unfortunately, no such means exists for me, so I just get the rare aquarium visit and drawings.