I took a course with Simon Lee in 2021. One of the principles he emphasized was not relying on using reference while sculpting. Copying a reference VS studying, internalizing and applying it are two very different things. This particular assignment was to apply our internal knowledge of movement, balance, and anatomy when sculpting and posing a figure from memory with no reference. It was humbling to find how much I already know and how much more I still have to learn.
I spent about an hour on each pose/sculpt. I hope to take some more classes with Simon in the future and would encourage sculptors of all skill levels to check it out.