Woops!! I forgot to answer your earlier question haha
So, I've got a tablet computer to paint, set up in front of my desktop computer with several screens. I did use all sorts of types of references for these constructions on the screens in front of me, but because they were on a different computer I could not "check my homework" by overlapping the ref and seeing where I messed up, which made the exercise harder but also better for learning.
Some of the standing ones were done from imagination, but nearly all of the sitting/crouching ones used some kind of ref, whether a photo, drawing, 3D model, or whatever was on Pinterest in front of me at that time. I'd start with the legs and work my way up through the body, using a mix of construction, appeal/intuition, and a lot of erasing. I tried to find the general shapes and rhythm lines rather than depict the anatomy exactly. Every pose took around 30 minutes due to the constant erasing and overall struggle.
Overall, you could say these were like what Marc suggests for 1-2min gesture drawings, except with more polish. I don't have an amazing workflow or process (yet), but I'm gonna keep grinding and see if something comes out of the mist.
