Yet another wonderful artist I was previously completely unaware of in The Bronze Age was Bob Oskner.
Bob was a great teen & humour artist, with a warm, friendly style that was deceptively simple looking. He also did
Angel & The Ape and
Welcome Back Kotter, to name just two Bronze Age favourites.
I'm not sure if Bob ever got to draw the Teen Titans, but if not he should've done, as he's one of those rare artists who could draw teenagers that actually look like teenagers.
As here with Mary Marvel, who's as bright & spunky as a teen heroine should be, but doesn't make you want to throttle her, like say, Kitty Pryde.