Frank Frazetta, the pompadoured New Yorker artist whose obsessively detailed paintings of shredded axe-wielding barbarians and their Playboyesque women made him the once and forever Michelangelo of fantasy art, did his best-known work in the 1960s and ’70s, and died in 2010 at age 82. Even if you don’t know the name, you’ve seen Frazetta’s…