I dug out several magnificent books I have on anatomy, especially for more dynamic representation, like in comics, etc. I have Hogarth, plus the one that is called Muscles in Motion by Glenn Fabry. In adition, I have just installed a software app called Poser Figure Artist, that I'm yet to figure out. The purpose of it is adjusting various 3D models in a position you want them to be, and from an angle you want to see them, and then drawing off of them as you would from any reference. I also want to check out those classical superhero comics. I was never fond of them in particular, but to know muscles, anatomy and movement that you often find in these, could be beneficial.