Computer - Morphing Studies looking at facial beauty

Beauty - 

Babies prefer to look at faces that are attractive, not just symmetrical

Facial Aesthetics: Babies Prefer Attractiveness to Symmetry 

"Infants as young as 4 months showed similarity with adults in the ‘aesthetic perception’ of attractiveness"

http://journals.sagepub.com/doi/abs/10.1068/p230823?id=p230823&

Evolving Attractive Faces Using Morphing Technology and a Genetic Algorithm: A New Approach to Determining Ideal Facial Aesthetics

Univariate analysis identified nasal width, eyebrow arch height, and lip thickness as being significantly correlated with attractiveness scores. 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3786677/#!po=16.8919

Also

Johnston VS. Mate choice decisions: the role of facial beauty. Trends Cogn Sci. 2006;10:9–13

https://www.ncbi.nlm.nih.gov/pubmed/16311066

Attractive Faces Are Only Average

we digitized samples of male and female faces, mathematically averaged them, and had adults judge the attractiveness of both the individual faces and the computer-generated composite images. Both male (three samples) and female (three samples) composite faces were judged as more attractive than almost all the individual faces comprising the composites. 
http://journals.sagepub.com/doi/abs/10.1111/j.1467-9280.1990.tb00079.x

Beholding beauty: How it's been studied

By Elizabeth Landau, CNN, 2012

http://www.cnn.com/2012/03/02/health/mental-health/beauty-brain-research/index.html