Can you suggest some memorable pieces of artwork from comic books?

Specifically, coloured artwork, which means most manga are probably off the list.

Note that, while I initially was aiming for memorable either plotwise, graphically or both, for all intents and purposes presentation is the most important part. Bonus points if it’s a particularly memorable event as well.

The idea is printing as many of them out as I can and cover my bedroom wall with it, since I recently took down most of my old posters. So far I’ve got some very good covers and some memorable moments form my favourite comcs (Spider crying from Transmetropolitan, John Horus informing the world that he has executed the president from Black Summer, Dream’s threat to hell itself from Sandman, Dick Grayson in his first appearance as Batman).