Research has shown that, in people, there are formulas of dimensional ratios that are considered beautiful.
They came up with this by taking a great numbers of both photographs and drawings and having a large number of people grade them on beauty.
They discovered that certain combinations were preferred more or less globally.
Different combinations seemed to work with different races and such but those were also fairly universal.
In other words the White person chose the same characteristics for a Black or Asian person as those chosen by Blacks or Asians and vice versa.
Color did seem to matter when they used drawings with neutral shading VS the same drawings with lighter and darker shading the lighter shadings came out ahead with people from all races, though they believe this is social conditioning more than anything else, it is universal.
The advantage of this method of testing is that there is no personality involved and because it is completely anonymous there is no peer pressure.
Of course there are no hard rules and there are always exceptions when you start dealing with real people, where expressiveness and personalities come into play results will vary. That however is attraction rather than beauty.
It was also noted that sometimes extremes of characteristics that break the rules are considered beautiful by those who otherwise fit the standards.
There is a college professor who is pushing the idea that ugliness is as sever a handicap as any other, such as race, gender or physical handicaps.
He claims that UgloAmericans are turned down for jobs, not chosen for projects, make considerably less money for an equal job, etc.