As a 3000 watchers special, I'll be showing you how I make most of my renders. I'm using daz3d for my renders https://www.daz3d.com/home , which you can download for free.
I also wrote this which is a couple of other tips and tricks.
1. Loading Character First I load in the character and give it a pose like here:
2. Posing I press strg + d to put her on the floor and make some adjustments (like for example her left hand).
If I make a custom pose, I use this tool https://www.daz3d.com/pose-builder-for-genesis-3
Or if I want to mix poses, I use this one https://www.daz3d.com/ultimate-pose-mixer
But you could also just use pins like in t