a) Early Ridleygram of the Space Jockey seat seen from behind
b) See: References "Hitler Masturbating", (1973) by Salvador Dali?
c) See: Evolution via Dali's "Dream Flight of a Bee Around a Pomegranate" and Plop! comic #13?
d) See: Evolution via Dali's Autumnal Cannibalism and illustration publicising the Grand Prix movie in Radio Times from 1974 ?
e) Other Ridleygram of Space Jockey seen from behind (380a in Giger's Alien book, although drawn by Ridley, I expect for HR Giger)
Was it drawn before or after the official storyboard above?
I don't really know, but perhaps it was afterwards.