Character designs for Cap and Mary by John Byrne from a proposed late 80s/early 90s revival.  I read about this in an issue of TwoMorrows’Back Issue, and IIRC, it would have featured the Marvels as the light counterpoints to a grim & gritty Fawcett City.  While I prefer the take we got in Jerry Ordway’sThe Power of Shazam!, this could’ve said some interesting things about the state of comics at the time.