How to evaluate the relationship between facial features and impressions?

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Evaluating the relationship between facial features and impressions requires:
1. Facial feature coding: Use standardized tools (e.g., Facial Action Coding System) to quantify physical traits (jawline, eye shape, symmetry) or expressions (smiles, frowns).
2. Impression surveys: Present participants with facial images and collect ratings on dimensions like trustworthiness, dominance, or attractiveness via Likert scales.
3. Experimental manipulation: Alter facial features (e.g., via photo editing) to test causal effects on impressions, comparing responses to original vs. modified images.