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I like the idea of u putting down the ribcage and pelvis for reference of how they are posed, but straight lines doesn't deliver enough imformation.

I recommend you use boxes, circles, and triangles for laying down quick imformation.

Also rule of thumb, lean towards triangles. (Calves, chin, Sometimes shoulder, Tits sorta.)

It's 100% duable in 30 seconds. GL ;P

These poses of a few lines can express pretty much and thats why i like them! But some of them (like 1st one) is unclear to me. I think when u draw poses, u shouldnt forget to show leg proportions. But as i said they are pretty and amazing!