The idea is to trace their hands and feet onto a large piece of paper (they might need help with this part), and then let them draw their head, body, arms, and legs in a way that looks like they are attached to their hands and feet. This gives the impression that they are floating away in space!

Oodles of Art: Falling back in Space Portraits! 3rd Grade
— Read on oodlesofart.blogspot.com/2009/04/falling-back-in-space-portraits-3rd.html