Frank Frazetta (1928-2010) was an American graphic artist primarily known for his fantasy work.
I came to know his stuff more though from his book cover designs for two of George McDonald Fraser's Flashman novels; Flashman At The Charge and Flash For Freedom which I thought I'd share here.
Great aren't they? Cheeky too! ;)
I think they perfectly capture that style of what was the moment (the 70s) as well as the bawdy roguish nature of the books themselves.