Mod from FeelThisMoment - v2.0 | Stable Diffusion Checkpoint | Civitai
For cute characters, include "lips" in your negative prompt.
(low quality, worst quality:1.4), lips
For mature characters, exclude "lips" in your negative prompt, and include "parted lips" or "lips" in your positive prompt.
1girl, parted lips, outdoors
(low quality, worst quality:1.4)