I gotta say that Mike Mignola is one of my favorite comic artists. All of you go real 'Hellboy' right now! His use of silouette, negative space and composition are excellent. His flat, graphic-ey style doesn't compromise the volume or 3D aspect of his art: Something alot of artists do when they take on a 'style', like Frank Miller's DK2 (or DK-poo), whatever.
Hayao Miyazaki's work on Naussicaa is one of my favorite comics ever. His european style panel arrangement and simple ink style convey an deep and awesome story. The greater number of panels per page allows for some great pacing.
Someone mentioned Humberto Ramos: I've gotta say I respected his work on Crimson. I didn't particularly love the story and the art was good and all, but that man held his deadlines! The only artist at Cliffhanger to do so: A true professional.
ps. Read Hellboy. Now.