This guy is a classic in the industry, pioneering the whole "fine art" in comics trend that's been germinating for decades. It comes out most often in painters and in cover art, but Sienkiewicz has been doing great interior art for years, too.

His linework is amazing. As an artist, I totally appreciate how difficult it is to make your art look that casual, but still fresh. Some of the pictures at left are from the Sandman: Endless Nights project with Neil Gaiman.