Depends on my current state.
- I am able to draw any pose, because I know Anatomy, Gesture, Proportions, and a long ETC.
- I developed a way to "think in 3D"... in my mind, I see a shape, for instance, a Cube... and I can rotate it and move it in my mind and transfer that picture onto paper or whatever.
- Since I know anatomy, I can do the same with poses. I simply think of a pose, I rotate it in my mind, and I transfer the image I'm seeing in my mind into paper.
- If I'm drawing often, I can ("literally") project the entire lines into paper, and I just trace the "imaginary lines" I'm seeing in paper.
- When I don't draw often, this skill gets "dormant", and takes me a lot of continuous practice to "get it" again.
THEN there's times when I'm not feeling like thinking and I just use reference.
So basically:
- Anatomy, Gesture and Proportion Knowledge = Unlocks unlimited poses.
- Constant drawing = Unlocks "3D thinking" and "line projection"
EDIT 2 = Sculpting helped a lot too!
- If not feeling like thinking, I just copy reference.
For this I used to draw 8 hours for 5 to 6 days, continuos Anatomy/Gesture practice... all digital because it's just practice.
Nowadays? I draw once a year, maybe twice if lucky.
EDIT: And I hope I don't get banned from saying this, but in essence, anatomy reference is just literally naked bodies. DO YOU KNOW SITES THAT OFFERS FREE PICS OF NAKED BODIES?


EDIT 3 = I never learned to draw shoes.