Facial Features Explained
Understand the features Smile Tracker measures — proportions, symmetry, and geometry that shape your analysis scores.
Analyze My Face →Jawline
The jawline defines the lower face contour from ear to chin. Its angle, width, and definition strongly influence face shape classification and perceived masculinity or femininity in AI facial analysis.
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Cheekbones
Cheekbones (zygomatic arches) mark the widest or most prominent lateral point of the midface. High, defined cheekbones create structural shadow and are central to diamond and heart face classifications.
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Facial Thirds
Classical proportion divides the face into three equal vertical zones: upper (hairline to brows), middle (brows to nose base), and lower (nose base to chin). Deviations signal unique character and affect harmony scores.
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Eye Spacing
Eye spacing measures the distance between the inner eye corners relative to eye width. Balanced spacing — roughly one eye-width between eyes — correlates with symmetry scores in AI face analysis.
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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.
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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.
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Forehead
Forehead height and width define the upper third of the face. A wide or high forehead influences heart and oval classifications, while a narrow forehead characterises triangle and some diamond shapes.
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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.
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Nose
The nose anchors midface proportion — its width, length, and projection balance the eyes and mouth. Nasal geometry interacts with facial thirds and contributes to profile harmony in AI analysis.
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Facial Symmetry
Facial symmetry measures left-right correspondence of landmarks — eyes, brows, nostrils, lip corners, and jaw contour. Near-symmetry correlates with higher harmony scores, though perfect symmetry is rare and unnatural.
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Skin Quality
Skin texture, tone evenness, and luminosity influence perceived age and vitality in AI analysis. While not a geometric landmark, skin signals feed youthful-energy scoring and overall impression.
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Eyebrows
Eyebrows frame the upper face and interact with eye shape, forehead proportion, and expression. Arch height, thickness, and spacing affect perceived emotion and canthal tilt appearance.
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Chin
Chin projection, width, and shape define the lower face terminus. Pointed chins characterise heart faces; wide chins suggest square or triangle shapes; recessed chins affect profile balance.
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Neck & Jaw-Neck Transition
The neck and jaw-neck transition (cervicomental angle) affect profile aesthetics and perceived age. Definition here complements jawline scoring and influences overall facial harmony in full-head portraits.
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Canthal Tilt
Canthal tilt measures the angle of the eye axis from inner to outer corner. Positive tilt (outer corner higher) reads as alert and youthful; negative tilt reads as soft or gentle.
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Midface
The midface spans from the brow ridge to the nose base, housing the eyes, cheeks, and nose. Midface length and compactness strongly influence perceived age — shorter midfaces often read younger.
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Under-Eye Area
The under-eye region — tear trough, orbital hollowing, and puffiness — is a primary age signal. Dark circles, bags, and hollowing affect youthful-energy scores independently of bone structure.
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Temple Width
Temple width contributes to upper-face silhouette alongside forehead and cheekbones. Narrow temples characterise diamond faces; wide temples appear in heart and some round shapes.
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Philtrum
The philtrum is the vertical groove between nose base and upper lip. Its length affects lower-third proportion and is a subtle but measurable signal in facial harmony analysis.
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Hairline
The hairline defines the upper boundary of the face and affects forehead height measurement. Receding or irregular hairlines shift facial third proportions and apparent face shape.
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See how features combine in our Facial Proportion Score or browse the Glossary.