well... not necessarily both... Writing and imaginary skills are the core of it, and the most important thing... Drawing or any visual art skill are a plus, definitly one, but only an extension of the writing or the mind, just a way to enforce the message you send can be understand more faithfully to your own initial idea without error. Web offers the opportunity to publish one self art or writing (or both) at low cost, and many software packages are just tools that can ease up the process...