Mitch Clem is my favorite webcomic artist/writer. I don't know if webcomics are typically considered Art, but most webcomic artists generally experiment with other art forms, digital and traditional. A webcomic almost documents the entire development of an artist's style, sometimes for over 10 years of drawing comics. I love Mitch Clem's style, the thick black outlines, the character's expressions, etc, but it's also his writing that makes his comics great, with his character development and sense of humor.