Version 2.0 update:
after I connected the grid pattern sometimes visible in bright or dark parts of the images with the fp4 training with OneTrainer, I switched to fp8 training, which got rid of the pattern. But I have to redo all my LoRAs to fix them all. Nothing changed, except the tag is now <lora:LyingOnBack-step01440:1>.

Flux is notoriously bad at creating anything which is lying down. The only pose I got was lying on the stomach and then the feet are wrong. I tried first to do a all-in-one solution, but after a lot of testing I had to hammer each pose into a separate LoRA. For example because you cannot really differentiate between lying flat on the back and a recumbent or reclined position - if you mention something with sitting, you'll get sitting, and the reclined images will taint the flat on the back ones.

I also noticed that you have to use a <lora:LyingFlatOnBack-150:1> tag, otherwise it is more or less chance if it will influence your image. The trained caption is "lying flat on her back".

Something I started here but had to be placed too in separate LoRAs to work is a finer control over face angles, body angles, camera angles and image area. But starting with this one, the captions are consistent as a preparation, even if they do not (yet) work standalone. The scheme is:

Face angles:
Full face view | Three-quarter face view | Two-third face view | Profile face view

Body angles:
Front angle shot | Three-quarter angle shot | Side angle shot | Three-quarter rear angle shot

Camera angle:
High camera angle | Eye level shot | Low camera angle | Shoulder level shot | Cowboy shot | Ground level shot

Image area:
Full-body portrait | Three-quarter-body portrait | Half-body portrait | Quarter-body portrait

It would be great if I get this to work!