Eye dimensions: 4.32w × 4.8h
Eye ratio: 1.11 (taller than wide)
Eye positions: 33% and 67% of width
Eye vertical: Centered at 54% down
Eye dimensions: 3.4 × 3.4 (perfect circles)
Eye ratio: 1.0
Smile: Bezier curve (arbitrary)
Smile width = 61.8% of face
Arc-based (circular segment)
Gentler curve
Ellipse-based (wider, gentler)
Two concentric arcs
Mathematical crescent
Minimal, balanced
Clean arc, balanced proportions