Individual face shape can be identified through self-examination and measurements or more complicated scientific methods. Face shape is determined by genes.
In 2012, an international group of researchers discovered five genes that determine the shape of the human face. They used magnetic resonance imaging along with portrait photographs to map the facial features of 10,000 individuals and used a genome-wide association approach to generalize their findings.
Individuals with access to technology can use a three-dimensional approach to map facial features or can take a simpler approach by using a mirror to complete a detailed self-examination and to take measurements which can then be used to analyze personal traits.