I wonder, was this the painting that originally had two cockpits? Harrison Ellenshaw is quoted in Christopher Finch's book "Special Effects" about how when he originally did the Falcon hangar matte, a lot of stuff was kept secret by Lucas and co., and all he had to work from were images of the full-sized half ship. He mistakenly assumed that the design was symmetrical, and painted the Falcon with a cockpit on each side.
I'm not sure whether Ellenshaw revised said painting, or if it's a third one we haven't seen.