1. A method comprising: displaying, within a graphical user interface, an image that depicts one or more faces; detecting one or more faces within the image; receiving user input that selects a face of the one or more faces to be a currently-selected face; selecting a set of images, from a collection of images, that closely match the currently-selected face; wherein an image in the set of images comprises a normalized face region that is normalized by: based on, at least in part, one or more distances between eyes, a nose, and a mouth depicted in a face region of the image, determining a profile type of a face depicted in the face region; based on, at least in part, the profile type, determining a transformation, and applying the transformation to the face region to generate the normalized face region; concurrently with displaying the currently-selected face, displaying each image in the set of images; providing, within the graphical user interface, a control that enables a user to select a target image from the set of images; and in response to detecting that the user has selected the target image using said control, associating the currently-selected face with a person to whom the target image corresponds; wherein the method is performed by one or more computing devices.