Paul Hogarth(1917-2001), one of the greatest British illustrators of the 20
th century illustrated a number of Graham Green book jackets of which I've got four. Contemporary of Ronald
Searle - and a close friend to him - he was inspired by his various journeys around the world as well as the great writers he befriended. Among them were Doris
Lessing, Brendan Behan, Stephen Spender, Lawrence
Durrell, Robert Graves and William Golding. His drawing are minimalistic but evoke the dark side of the characters and the mood of the book quite brilliantly. Here's a link for his obituary in The Independent from January 2002:
http://www.hogarth.org.uk/resource/obits/paul2002.htm