# Eyebrow Tilt

Harmony · Front view · Eyes · https://www.faceiqlabs.com/support/harmony/eyebrow-tilt

The slope from the inner brow to its arch region, averaged across both brows.

## What is measured

Calculation: Mean angle of inner-brow midpoint to arch midpoint against horizontal

## Why it matters

Brow inclination frames the eye and changes the direction of the upper-face contours. The tail can curve down while the measured inner-to-arch line still rises.

- Lower: a flatter or downward inner-to-arch direction.
- Higher: a stronger upward inner-to-arch direction.

## Where the idea comes from

Evidence: FaceIQ adaptation. Brow-shape preferences have been studied using edited portraits. FaceIQ measures an inner-to-arch angle; the cited study tested apex placement rather than validating this exact slope.

## A worked example

A brow rises 5 units over a 35-unit horizontal run: arctan(5 ÷ 35) ≈ 8.1°.

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

## How to read your result

Do not measure from brow head to tail. Brow movement and grooming can change the result.

## 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.

- Biller & Kim (2009). [A contemporary assessment of facial aesthetic preferences](https://pubmed.ncbi.nlm.nih.gov/19289680/). Compared ratings of edited brow and nose features on four female models. The authors emphasized individual facial harmony; this is context for feature relationships, not a test of every brow metric.

---

Source: https://www.faceiqlabs.com/support/harmony/eyebrow-tilt · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt