1. A method of generating a model of an individual comprising: generating a plurality of principle component analysis models utilising images of individuals, the individuals utilised to generate each principle component analysis model sharing at least one identifying characteristic; identifying at least one identifying characteristic of a target individual; and generating a model for said target individual utilising a selected principle component analysis model, wherein said selected model comprises a said principle component analysis model generated utilising individuals sharing said at least one identifying characteristic with said target individual.