I am always wary of these kinds of studies that conclude evolutionary reasons - and yet were performed within the confines of a single culture. I think that sexual preferences are mainly cultural and specific to a certain time period. Just off the top of my head, female beauty seems to be defined rather differently in the US vs. Japan:
Curvy bottoms vs. smallish bottoms
Tanned and toned vs. pale (美白) and girly
Handsome features vs. "small face" (小顔)
...and so on. Of course there are commonalities as well, such as symmetry and apparent healthiness.
On the other hand, you can also see that the Japanese perception of female beauty during the Edo and other eras was quite different from the typical Japanese beauty today - take a look at "ukiyoe" drawings where the women have quite chubby and flat faces, with long but thin eyes (they like more 3-dimensional faces with large eyes today).
A better way to get evolutionary reasoning for beauty would be to research a much larger data set, taken from multiple cultures around the world, and to use data science to see patterns within.