Most people are unaware of this, but J.R.R. Tolkien illustrated his books. He painted for The Hobbit in particular, depicting various events. His hobbit holes are huge, with rounded interiors but fifteen feet in diameter, more than enough room for big people as well.
Well someone found some undiscovered art by Tolkien, and what has been released consists of several images of the Lonely Mountain, most in ink but one painted:
You can see he's evoking medieval art while giving it superior perspective and modeling in the process. I like his style a lot, particularly in ink. Geek Tyrant has more of the images, and they're part of a new book coming out about Hobbit art that Tolkien did.