Pictured are two different paperback covers (earlier and later editions) for three separate Agatha Christie titles. All art work is by Tom Adams.
The Murder at the Vicarage, first published 1930. The early cover above is the 1963 third impression paperback; the later cover below is the 1977 eleventh impression. Both by Fontana (UK).
Evil Under the Sun, first published 1941. The cover pictured above is the 1973 US edition paperback by Pocket Books; the cover below is the 1977 twentieth impression paperback by Fontana (UK).
My favourites? Definitely the early edition of The Murder at the Vicarage, and the UK edition of Evil Under the Sun. The voodoo doll with its twisted, misshapen limbs is one of my favourite Tom Adams' covers, period.