a) The trophy display from Predator 2 (film released 1990)
b) Anima Mia (work 487) (1980/1981) by HR Giger
d) Buttocks becomes another but smaller skull
e) Female humanoid with midget armed with leaf blower becomes another skull of an alien animal.
g) Leg on the lower right becomes skull with spine.
h) This area in the upper right featuring a variety of floating forms would become the Gigeresque Alien head, but it's hard to really translate the details into that since there isn't a single strict solid form.
i) Meanwhile the buttocks on the lower left probably become the human skull and spine on the centre right.
j) Perhaps the skull shoulder on the centre right becomes a skull as well.