I don't have my copy of the book handy, so I'm not able to comment on how closely these guys match up to whatever description Tolkien provides, if any. My gut reaction, though, is a positive one. These three look a lot more "dwarf-y" to me than Gimli did in The Lord of the Rings and, provided there are no more dwarf-tossing jokes in The Hobbit, go some way toward redressing the wrong done to Durin's folk previously. Mind you, I've never had much of a problem with the way Middle-earth looked in Jackson's movies; it was their tone that annoyed me at times. So, I see this photo as a definite positive, but the proof, as always, will be in the script.