Superwoman is the name of several fictional characters from DC Comics. Most of them are, like Supergirl, women with powers similar to those of Superman, like flight, invulnerability, and enhanced strength.
Superwoman along with Batwoman and Superlad from Superman/Batman#24. Art by Ed McGuinness
The Dana Dearden Superwoman
George Roussos, also known under the pseudonym George Bell, was an American comic book artist best known as one of Jack Kirby's Silver Age inkers, including on landmark early issues of Marvel Comics' Fantastic Four. Over five decades, he created artwork for numerous publishers, including EC Comics, and he was a staff colorist for Marvel Comics.
Roussos at his drawing board in 1941
Nedor Comics' Adventures Into Darkness #5, cover art by Roussos
One of comics' most famous covers: The Avengers #4 (March 1964), penciled by Jack Kirby and inked by Roussos.