a) The cover of "Les Exilés De La Terre" by Andre Laurie (1880s) and Salvador Dali's "Dali Martian Muni D'un Double Microscope Holoelectronique" (1974).
Many thanks to "Dark Nebula" for pointing out the book cover in relation to Giger's Space Jockey. See: http://www.alien-covenant.com/topic/42669)
It's now my belief that Dali would have taken note of the earlier book cover illustration when drawing his Dali Martian.
b) On the book cover, where the human's foot touches the rolled up blanket,
Dali transforms this into a sock that's nearly pulled off the Martian's foot.
c) So it's the viewfinder on the telescope that transforms into the Martian's head.
d) One bent leg is visible of the human and one bent leg is visible of the Dali Martian. Part of the latter character's other leg is visible but goes off the side of the picture.
e) Dali takes the three legs of the tripod and separates them and inspired by the presence of parts of the writing transforms them into crutches
Martian Dali equipped with a double holoelectronic microscope (1974)
g) Perhaps Dali gave the Martian a tale because of the way the shadow bleeds into the rock behind and Dali thought he could expand the body shape in that direction.
h) There is a skirt like form at the top of the human's telescope and Dali transforms this into a soft banana like form resting on the top of the upper part of Dali's biological equivalent of the telescope (that has been transformed here into a double holoeletronic microscope)
i) Chris Foss took the Dali illustration and transformed it into a closeup of parts of a spaceship, and Giger absorbed elements of the Dali illustration and the Chris Foss into his own Space Jockey design, from Dali, such as the arrangement of the crutch supports, he used for the supports for his Space Jockey's telescope.
j) Looking at the the cover illustration for "Les Exilés De La Terre" by Andre Laurie, one wonders if Giger knew about this too and how it related to the later Dali drawing, and if he included aspects of this drawing in the idea for his own Space Jockey.