Working on figures. Need advice.

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Hey everyone. I've been working on some figure/anatomy studies lately to try and get better at being spontaneous about drawing bodies. I've gone through Hampton, and I find that i have a difficult time figuring out what certain forms are "under" the skin. I've sat down and documented all the major superficial muscles and how they attach. But seeing it on an actual person, especially in funky poses, often confuses me.

These were done in about 3-5 minutes each off of various references. The top 2/3 were done from photos, the bottom 3 images were done from posemaniacs.

I think with photos, I'll often see shapes but not be able to identify exactly what muscle or ligament it's supposed to be.

I'd appreciate any critique or general advice.