I thought of (and started) doing another “from behind” sketch, but hardly got anywhere before realizing that it was more a question of musculature and angle than anything else, and I’m not really prepared to handle either of those at the moment. I need to do some research, maybe even do some drawing in pencil again, because I’ll probably make a lot of mistakes along the way.
While I’m not going to bother showing the aborted sketch, I’ll show you this one I did afterwards instead: