The artists are respectively Dave Sim of Cerebus fame. David Mazzuchelli who had drawn many good books before doing his own thing. And then there's Kelley Jones whose main schtick is drawing very much in an exaggerated and intense style that emphasizes mood and atmosphere and a certain sense of design. None of them are drawing in a realistic manner and yet they're known, loved, and successful as far as western artists go.
Dave Sim drew a 300 issue series named Cerevus the Aadvark, all self-published via his company and on a consistent time-table, known for its quality of art and writing as it developed.
David Mazzuchelli is a very well-known and well-loved artist whose works appeared in very mainstream books and iconic works, Daredevil: Born Again and Batman: Year One come to mind in his realistic phase, he's also a well-known cartoonist whose work and skill make itself shown in Asterios Polyp.
Kelley Jones is a man who comes from Bernie Wrightson's tradition but moves off in another direction from his master/mentor by just doing what he wants. Doing what he wants means muscles upon muscles, drawing from his imagination and having fun with every line, designing characters to meet his ends which border on the macabre but are punctuated with a kind of of gorey and dark humor. He's drawn many a Batman and Swamp Thing comic, and he was chosen by Bernie Wrightson to finish his Frankenstein comic book with IDW.
Then there is Bill Waterson, Will Eisner, Matteo Scalera, Mike Mignola, Frank Miller, Eric Powell. The list goes on and on and on.
tl;dr: Neither of you know what you're talking about.