a) Scene 56 ext.planet ridleygram for Alien "They move off: we see a skeleton"
(1978) by Ridley Scott
b) There's not much to go by other than some assumption that the Dad's Army photograph and then I do
c) The whole page from the Radio Times covering programs for 15th November 1974.
Please note here that the photo at the bottom for a Rowenta advert, I have already talked about in relation to another of Ridley Scott's Alien storyboards which gives an added reason as to why he might have taken note of it. (See Alien: Early Ridleygram showing the underside of the facehugger from Kane's view)
d) Character in the background with a blanket over his legs becomes amorphous rock formations.
e) With that would be the idea the Space Jockey corpse was generally lying across the composition in a way similar to the central character Captain Mannering or even the character to the right Sgt. Arthur Wilson.
Nothing can be be that specific.