1. A computer-implemented method comprising: determining a face model of a face in a photo; determining a focal length associated with the face based on depth information, wherein the depth information is based on depth cues provided by matching the face with one or more reference images associated with a known user of a social network system to determine that the face in the photo is a known object; providing a slider to a user via a user interface to adjust the focal length; receiving user input that indicates a movement of the slider; simulating a change in the focal length based on the face model and the user input to produce a new photo, wherein simulating the change in the focal length comprises normalizing the face, adjusting a size of a facial feature after the normalizing, and undoing the normalizing after adjusting the size of the facial feature, wherein adjusting the size of the facial feature comprises at least one of: moving face landmarks corresponding to the facial feature closer to each other to decrease the size of the facial feature corresponding to increase in the focal length; and moving the face landmarks corresponding to the facial feature away from each other to increase the size of the facial feature corresponding to decrease in the focal length; and causing the new photo to be displayed in the user interface.