Not that I know much about any of it, but there's a lot of different ways to make art for Magic. From your "traditional" methods to the newest forms of creation, Magic art is created in a variety of ways, much of which is, like most other things these days, digital.

But not Dragons of Tarkir. 

Much of the set was done the old-fashioned way, and the good folks at Original Magic art have brought together almost all of it for you here. If you're into looking at pretty Magic pictures or learning more about the art behind the set, I highly recommend checking it out.