TWO POSTS IN ONE DAY? WHAT IS THIS? PRODUCTIVITY??? ON MY PATREON?
So here is the (basic) process for working out poses and anatomy in the context of a larger composition. I'm not going to go in depth on How to Anatomy here because that is a post (hell, a book---an entire undergraduate course) all on its own. But hopefully this shows how I think about working up poses and the considerations I make at this stage of the piece.
Composition resources
Art and Visual Perception: A Psychology of the Creative Eye by Rudolf Arnheim
https://archive.org/details/artvisualpercept00arnh_0/page/n11/mode/2up
Rule of Thirds
https://en.wikipedia.org/wiki/Rule_of_thirds
Pose reference resources:
NSFW! GaySexPositions.Guide
https://gaysexpositions.guide/
Pornhub! (I don't need to link that, do I?)
Google Images (Surely to god I don't need to link that either)
Magic Poser
https://magicposer.com/
Anatomy resources:
Figure Drawing for All It's Worth by Andrew Loomis
https://archive.org/details/loomis_FIGURE_draw
Drawing the Head & Hands by Andrew Loomis
https://archive.org/details/andrew-loomis-drawing-the-head-hands