Alien: HR Giger's Landscape (work 385) (1978) with alien astronaut corpse: One leg or two?

Detail from painting of the planetoid landscape (work 385) (1978) (detail)

 

a.i) In Giger's painting of the planetoid landscape (work 385) we see an image of the remains of a humanoid figure that would have been of the Space Jockey when they had decided to have it as something seen unnoticed on the surface of the planetoid landscape. 

a.ii) Once I knew about this detail, and looked at the image that Ridley Scott selected from Necronom V the concept of the Space Jockey which appeared to be this nearly humanoid skeletal thing with one limb where the two legs would be, (SEE: Evolution via Giger's Necronomicon pt 1 (Early storyboard references Giger's Necronom V)

a.iii) So I began to wonder whether this space jockey corpse should have one lower limb or two. Giger's Alien landscape (work 385) Detail from painting of the planetoid landscape (work 385) (detail)

Giger's Alien landscape (work 385)

b.i) In 2013, Giger's Alien Diaries (7 & 8) were published and on page possible p42 of the actual book and page 23 of Giger's own diary number 7 was a drawing of the space jockey. 

b.ii) This entity again looks as if it might have one limb for a leg or maybe the other one is hidden or it's just not clear, and one might think that it's cradled in the palm of a giant hand as if the rock shape at the bottom left is a thumb. dead alien astronaut sketch from Giger's Alien Diaries 

dead alien astronaut sketch from Giger's Alien Diaries