Baked for a bounty.

Keyword: puckered lips

It seemed to work best when I used token weight 1.2-1.5 for 'puckered lips' and added 'huge lips'

I also put teeth, tongue in the negative which seemed to help with the odd artifacts that frequently show up in the center of the lips

I tested mostly with euler_ancestral_cfg_pp / beta 14 steps 1.4 cfg

Best results with

https://civitai.com/models/534425?modelVersionId=748555