1. A method for determining similar faces within images based on a perception of facial similarity, the method comprising: assessing, by at least one processor, training data representing perceptions of one or more training users regarding a similarity of a first set of two different training faces relative to a similarity of a second set of two different training faces; determining, based on the accessed training data, similarity information that indicates human perception of facial similarity; receiving a query image that includes a query face; determining, by at least one processor, one or more search result images that include at least one face that is similar to the query face based on the similarity information that indicates human perception of facial similarity; and providing the search result images to a user.