This jacket is so good - there's so much going on in these four faces yet still eye-catching as a book cover. All illustrations and designs I've seen by Cecil Keeling (born in Teddington, Middlesex 1912 and died in 1976) are elegant and quite distinctive. Here's a link for his work on a 1947 book called "Pictures From Persia" http://www.fulltable.com/VTS/aoi/k/keeling/ck.htm
I'm hoping to find some more of his books one day - I've not read this one yet!