Alien: HR Giger's Alien II chestbursters (1978) ( work 368) concept art references Francis Bacon Three Studies for Figures at the Base of a Crucifixion c.1944?

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Alien: HR Giger's chestburster concept 

a) Giger's Alien stage II chestburster (work 368)

Giger's Alien stage II chestburster (work 368)

1. HR Giger: The chestburster, that was a very heavy scene, l think the strongest thing in the whole film. The idea came from a painting from Francis Bacon. Ridley Scott told me about this painting of '46 - it's just a crucifixion - and one of the members has just teeth and rats flesh... He liked to have the chestburster like that. l did some designs. They looked like chickens. Something like chickens without feathers, but l was not happy with them. (Alien documentary on Alien Quadrilogy)

b) Three Studies for Figures at the Base of a Crucifixion c.1944 by Francis Bacon

Three Studies for Figures at the Base of a Crucifixion c.1944

c) Bacon creature and side view chestburster comparison

d) Bacon creature and front view creatures comparison.

The cloth hanging down the sides appears to have been turn into the entrails haning from the mouth.