The following paper is a breakthrough in facial feature recognition and numeric representation of facial features and may be helpful to understand the genomic basis of facial features (once the relevant dimensions of the phenome are identified), but also to help to recognize the emotional expression in human faces [1,2].
[1] http://www.cell.com/cell/fulltext/S0092-8674(17)30538-X
[2] http://www.bbc.co.uk/news/science-environment-4013124