I don't own a lot of original comic art, but I do own four pieces of original art from Superman by Curt Swan. They've been matted and framed and now hang on the wall in my back hallway. This makes scanning them troublesome, but I did recently pull out the digital camera:
Here the four pieces hang side-by-side on the wall.
Superman vs. Chemo from Superman #382, inked by Dave Hunt.
Lana Lang confronts Jimmy Olsen and new cub reporter Justin Moore in Superman #383, inked by Dave Hunt.
Jimmy Olsen discovers a villain at a radio telescope in Superman #378, inked by Dave Hunt.
(larger) (more glare but more legible)
Lois Lane infiltrates the villains' lair. Can she uncover their plot to use a deadly Hydrogen Bomb?! From Superman #238, inked by Murphy Anderson.