# Cupid's Bow Depth

Harmony · Front view · Mouth · https://www.faceiqlabs.com/support/harmony/cupid-s-bow-depth

The vertical drop from the marked upper-lip peak to the central dip of the Cupid’s bow.

## What is measured

Calculation: (Central-dip y − upper-lip-peak y) × photo scale

## Why it matters

The central dip shapes the upper-lip outline. Its depth describes a local contour that can differ even between lips with the same overall height and width.

- Lower: a shallower dip at the center of the upper lip.
- Higher: a deeper dip relative to the marked lip peak.

## Where the idea comes from

Evidence: FaceIQ adaptation. This is a FaceIQ landmark-based description of facial shape. The linked research provides background on facial measurement or perception; it has not directly validated this exact formula or its score.

## A worked example

A 12-unit vertical drop at 0.2 estimated mm per unit gives 2.4 mm.

Example values explain the calculation. They are not a target range.

## How to read your result

Mark the natural lip border. Makeup, a smile and asymmetric peaks can alter the apparent dip.

Millimeters are approximate: FaceIQ scales the photo using an assumed 190 mm hairline-to-chin height, so these are estimates, not calibrated physical measurements.

## Research & further reading

These sources explain the history or related evidence. FaceIQ’s score weights and reference ranges are model settings; the papers do not collectively validate the scoring system.

- Gibelli et al. (2015). [A Quantitative Analysis of Lip Aesthetics: The Influence of Gender and Aging](https://pubmed.ncbi.nlm.nih.gov/25948067/). Measured lip area, volume and thickness across sex and age groups. This describes lip morphology; it does not establish a universally attractive lower-to-upper lip ratio.

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Source: https://www.faceiqlabs.com/support/harmony/cupid-s-bow-depth · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt