Why seriousness? Try to prompt something in positive about "human" that does not piss off your checkpoint.
I was searching for this prompt that could generate a perfect body in positive prompt without getting something seriously dumb-looking. The moment you look at it, most of you will have that Marty McFly meme in mind:
"bodily-equalities"
Keep your negative prompts empty for testing. Sadly for it, for you it will be trial-and-error when it comes to weights. Some checkpoints did only accept numeric weights while others only accepted one single bracket. Mostly, my checkpoints stopped generating colors or other things after i used more than one bracket.
I tested it very successfully on SD, SDXL and SD XL Turbo (Turbo makes no real difference for me, but i was curious).
And another warning: since it has "equalities" in it, every time you use "realistic" in anime-checkpoints or realistic checkpoints in general, you will see many mixed races and skin-tones. This is one thing that isadly can't change. Just put in positive or negative what you prefer.
Sorry, I forgot ONE super important point:
Prompt clothes!!! :D