What an AI face enhancer should preserve
A face enhancer should make an existing person easier to see, not redesign the portrait. The selected workflow focuses processing on facial detail while the scene remains a photograph of the same person. Strong motion blur, an occluding hand, extreme profile angles, or a face only a few pixels wide can leave too little evidence for reliable recovery.
Reject a result when it changes identity, expression, age, eyewear, facial hair, or another defining feature, even if the output looks technically sharper.