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So you had a second photo of the girl, taken by a team mate, but it has only her in it?

OK then, there is something identifying about this girl, which the second photo gave you

* Tattoo

* Glasses

* Hair

* Amputee

* Scar/burn, etc.

* particular purse/hat/watch/accessory

* etc.

Or maybe she was wearing a t-shirt brandishing the company she works for.

An article of clothing or accessory of some kind from a conference she attended that helped you look up attendees and identify her, or some other identifying club/service that contains profile pictures?

Name tag

But it had _something else_ in it...

A credit card slip with her name on it perhaps?

In a single picture where she was a random bystander? Unlikely that you'd be able to read anything that had her name on it, unless it was an actual name tag. Even then, people don't generally stand very still for photos that are taken of other people.

Sorority/college sweater?