Nudity, nsfw, erotic,
Teeth, 
Do not produce low-resolution images.
Avoid generating images with errors.
Do not create images with incomplete heads.
Avoid creating images with visual artifacts.
Do not fuse.
Avoid cropping important parts of the image.
Do not generate images with unclear facial features.
Avoid creating images with cross-eyed characters.
Do not create images with headless figures.
Avoid generating images with blurry faces.
Avoid generating images where important parts of the subject are out of frame.