(Cover for the 1967 edition of vol. 1 of The Moon is a Harsh Mistress (1965), Robert A. Heinlein) The Portuguese painter and illustrator Lima de Freitas (1927-1998) created a vast number of covers …
I would love to see a resurgence in drawn/painted cover art but I'm guessing it's too expensive (lowers profit margin) for the big publishers these days.