There is no reason a Commonplace Book cannot contain images from comic books. I grabbed four images today that I thought were great details in great comic books.
The first is from Grant Morrison and Frank Quitely's WE3 3: a dead body stares blankly at the sky; bullets rained down from the sky on her, and now actual rain strikes her retina, creating a beautiful crown of water.
The second is from Grant Morrison and Ed McGuinness's JLA: Classified 2: Batman is supervising the Squire, who is hung, Mission Impossible-style, over a cube of stars -- an infant universe -- trying to contact the missing JLA; her pony-tail gets a separate suspension apparatus.
The third is from Frank Miller's Sin City: That Yellow Bastard. A figure with a revolver emerges from the shadows; going for minimalism and a hyperbolic stark black and white, Miller has not drawn the barrel of the gun: he draws the tip of the gun but there is a large part of the barrel that the viewer just mentally fills in.
The fouth -- actually two images -- are the Travis Charest covers to the two collections of Alan Moore's WildC.A.Ts run. Charest is a great artist, one of my top five, who works slowly and has spent years on a legendary project no one has seen. He has a weird sense of humor, and his covers here place the team and their enemies -- fairly standard comic book action heroes -- in a version of the Gap Kahki adds. Genius.