Rasputin by Mike Mignola * More
How to Build a Better Graveyard, by Mike Mignola
Mike Mignola’s sketchbook pages from the Hellboy: The Right Hand of Doom trade
Hellboy In Hell #1 - Cover by Mike Mignola
B.P.R.D.: 1947 #2
BPRD Black Flame #06
Batman by Mike Mignola
I don't know a ton about Hellboy, but this is cool art.