I just installed stable diffusion yesterday and this is my first try with it. I tried the deepnude program but its 2 years old and it's really a piece of shit compared to this.
It is a lot more effort than I expected though lol. I think the next step is to train a Dreambooth model to generate new pictures, cause they look better than these.
For the prompts, I kept it pretty simple, I only saved the one for the "arms in the air" photos:
small teen sitting on bed with her arms in the air, stretching, seductive, exposing naked breasts, armpits, ((visible nipples)), (small breasts), bondage, bdsm, dungeon