a) Mordor IV (Work 280) (1975) by HR Giger
b) Illustration from Linda C. Cain and Susan Rosenbaum's Blast Off (1973) by Leo and Diane Dillon.
c) There appears to be the image of female legs and hips with the long baguette like flute going up between and the curve stretching across the legs and crotch would be where the orange shirt goes behind the girl's afro hairstyle.
d) So the girl's head space with afro becomes a space for small head that looks as if it's playing the baguette flute and the end of the croissant like form that looks as if it's the end of a large croissant or leach like musical instrument with four valves on the side running up the centre of the drawing.
e) The arm stretching downwards of the person in the orange t-shirt becomes the the ethereal woman's leg on the left . Along with the features of the girl's face here, perhaps the fingers stretching down helped to spark of the idea of the row of suckers seen from the side looking almost like trumpet valves. The circle being drawn in the rocket could have become the circle on the ankle of the animal leg.
f) The legs of the girl with the afro becomes the lower bend of the crescent shaped instrument on the lower left that looks like a circus sealion performing with its tail in the air, while the legs of the girl with the orange hair becomes part of the shaped of the structure going up the left that might be a keyboard with ribs instead of keys.
g) The side ponytails of the girl with the orange hair would become the very top of the tail end of the sealion like structure, with the ribbon becoming a little arm that's holding it.