| Identifier | Notes |
|---|---|
| Any facial photography | |
| Face | |
| Intrinsic to the participant | |
| Anatomic anomalies | |
| Birthmark | |
| Scar | |
| Other | |
| On the participant | |
| Unique clothing | |
| Jewelry | |
| Piercings | |
| Tattoos | |
| Other | |
| Around the participant | |
| Unique setting | |
| Unique surrounding | |
| Unique location | |
| Other |
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