Once somebody has your faceprint, they are able to used it for 3D modeling of your face.
Some companies claim they can infer other things from your faceprint, such as emotions, sexual orientation, age or gender, but these methods are unconfirmed.

This educational resource is part of our interactive exhibition The Glass Room, a project by Tactical Tech: theglassroom.org/en/what-the-future-wants/exhibits/the-real-life-of-your-selfie-wtfw/