LipsHow AI measures this feature and photo tips
Lips are key expressive features affecting smile scoring, perceived warmth, and lower-face proportion. Fullness, symmetry, and smile dynamics all feed into Smile Tracker's blendshape and landmark analysis.
See this feature in action with our Face Analyser, Face Shape Analyzer, or Guess My Age.
Key Characteristics
- ✦Upper and lower lip volume
- ✦Lip symmetry at rest and in smile
- ✦Cupid's bow shape
- ✦Corner lift during Duchenne smile
- ✦Colour and texture as secondary signals
Analysis & Photo Tips
- 📸Natural light shows lip texture evenly
- 📸Hydrated lips photograph more evenly
- 📸Genuine smiles activate orbicularis oculi with lip corners
- 📸Avoid overlined makeup for accurate analysis
Related Features
Lip Ratio
Lip ratio compares upper to lower lip fullness and mouth width relative to nose width. The 1:1.6 upper-to-lower ratio appears frequently in beauty research, though individual variation is substantial.
Lips
Lips are key expressive features affecting smile scoring, perceived warmth, and lower-face proportion. Fullness, symmetry, and smile dynamics all feed into Smile Tracker's blendshape and landmark analysis.
Nose-to-Mouth Ratio
The nose-to-mouth ratio compares nasal width to mouth width and the vertical distance between nose base and upper lip. Balanced ratios contribute to lower-third harmony in facial proportion scoring.
FAQ — Lips
How does AI analyse lips?
Landmark detection maps lip corners, cupid's bow, and vermillion border to measure symmetry, ratio, and smile activation.
What lip shape is most common?
Most people have moderate fullness with slight asymmetry. Extreme thin or full lips are less common but equally valid.
Do lips affect smile score?
Yes. Lip corner elevation, symmetry, and Duchenne activation are core inputs to Smile Tracker's smile scoring model.