There are some common parameters of beauty, mainly connected to the Fibonacci ratio. BUT, depending on the culture, where we were born and our archetypes, we will different perceptions of the beauty and here comes "the eye of the beholder". But still, there is a balance between nature and personal inclinations
What about beyond looks though, are there any uniform traits that the vast majority find attractive or unattractive? For example, does anyone find whining attractive?
If you ask this to hypochondriac people, they will like find it attractive as well.
Anyway, I was talking about beauty in the sense of appearance, and there are also scientific studies about how some traits are much more attractive than others, across the world, depending on the region of the investigation
In terms of appearance, symmetry is important. Balance. Perhaps it is the same for emotional states too.