@gblair - There's definitely a couple hours of sculpting there George. I do typically have a bunch of anatomy reference on my 2 main screens while I'm sculpting on the third. It's still a challenge to interpret what muscle groups do in different situations, but I do find it fun and interesting. I've always been an anatomy fan. And, it really is like anything else, it's just time. If you like doing a thing, whatever it may be, you spend time doing it and you get better. Having a fine art background does definitely help. I did some traditional sculpting in college and having worked in 3D for 30 years, this was a bit of a natural progression. I do watch a lot of YouTube videos for specific tools and techniques within ZBrush though.
I'm starting to add the enemies and attempting to maintain natural proportions while also attempting to honor Frazetta's composition. There's just so much hidden in the painting that I don't get to hide.
1 attached image. Click to enlarge.