It was obvious from the beginning that the most important issue to represent in the Lucy sculpture was locomotion, including upright walking as well as the issue of whether she climbed trees.
Was there a way to represent both climbing and upright walking in the same pose? It would be tricky, but perhaps I could depict a moment of transition, where it is obvious that Lucy is climbing down from a tree, and equally obvious that she is dropping into an upright position (as opposed to dropping to all fours).
To narrow my search for appropriate poses, I decided to photograph a human climber, preferably a female adult and preferably without clothing, so that I could see how the various muscle groups were being used. The exercise yielded good references for the kind of transitional pose I was looking for.