a) Predator 2 storyboard for the skull trophy display
AVP Galaxy uploaded the Predator 2 shooting dossier on November 21st 2020, and this was one of the storyboards featured.
(See Predator 2 Shooting draft dossier from https://www.avpgalaxy.net/2020/11/21/want-some-candy-alien-vs-predator-galaxy-presents-the-shooting-script-of-predator-2/)
b) Chiquita (Work 190) (1972) by HR Giger
Because I realised that the final skull trophy display in the Predator 2 film was loosely based upon Giger's Anima Mia environment, (see: Predator 2 : Chiquita (Work 190) (1972) by HR Giger referenced in storyboard for the skull trophy display?) I looked for another of Giger's environment that this storyboard would have been based upon and Chiquita matched up most of all.
c.i) The Left side
c.ii) The dark space becomes the dark area of the skull
c.iv) Little heads that become the teeth
The row of small animal like characters and heads would appear to be like a deformed row of teeth and that might become the teeth for the wide skull on the lower left of the drawing.
c.v) Buttocks and upper leg like formation on the upper left become the upper left skull formation with a ring hole through the centre or perhaps conjoined horn tips.
d.i) Middle area becomes
d.ii) Phallic forms that become an Alien beast head
The ends of two phallic forms meeting like a ying and yang symbol be becomes the head of the familiar Slien beast
The pale horizontal phallic form becomes the front of the Alien head, while the split side of the similar phallic form below that is less bright perhaps becomes the mouth.
Perhaps the thing that looks like a label within a rectangle further along this pale phallic form becomes the square feature within the drawing
d.iv) Humanoid background figure becomes another animal skull
While this area has already been used for a large skull with the spine, I think that the artist went back to use the details from that area.
Looking for what the artist might have taken ideas for for the upper mid left skull, there's a lower female torso that might almost be an insect-like head peering out of the darkness and there is the female figure's upper body as well to consider that near enough might form a face of sorts
d.v) Background human with ribbed head dress becomes a skull with one eyes socket abover the other
The small skull to the upper left of the large skull is I think based upon the female with a bulbous ribbed headware seen over the left send of the right horizontal phallic form.
e.i) The right side
This upper body of insectish humanoid character with cape becomes the upper part of the skull
e.ii) Background details become an animal skull with brow ridges like goat horns
Details in the shadow become the skull shape. In this snippet from Giger's painting, the right side has been reflected to make a full skull face of some sort.
e.iii) Winged humanoid form becomes mechanical looking skull
A dimly lit winged humanoid half becomes a simple skull seen from the side with the wings becoming the eye sockets.
The feet become the front of the lower jaw while the lower leg becomes the front of the face.
e.iv) Lower right details become a mask like face seen from the side
Details from the far lower right of the painting become transformed into another simple skull seen from the side.
I suppose that the dark empty space between the curved pipe and the bulbous end of a bone like form become the eye socket with the end missing , while the centre of the bulbous form becomes the space in the side of the jaw and the finger like forms at the bottom of the snippet become the pointed chin, while a vertical thumb like form becomes what might be a nostril.
Come to think of it, it might be more realistic to say that what I had thought was an eye socket might well be an open space between horns, and what I have sad was a nostril might well be an eye socket