What, exactly, are our heroes doing here? Considering that they're all looking into the sky and waving, and that Superman is nowhere to be seen, I'm gonna bet the Man of Steel was a separate piece of art but meant to be part the overall picture. Considering the inclusion of Firestorm and Cyborg--not generally seen on the stock art--I'm gonna bet it was meant for some piece of merchandising tied to Galactic Guardians/The Super Powers Show. Somebody call in Detective Chimp!
(h/t: F.O.A.M.er Ilke Hincer)