>>7619633
I unironically recommend Bridgman. I'm starting to think that the best way to study the form of something is to simply rotate a form and try to draw it from different angles. The less familiar you are with the form, the less you can turn it, but if you're 100% familiar with a form, you should be able to draw the 90 degree angle accurately

I'm nowhere near that level for the human body, but Bridgman seems like a good way to simplify the form of the body so that you CAN do that