Could be, this is the most interesting term (or word) to be used as a subject. It is also a term that has a high popularity level in human life, therefore, become a term that very often emerge from mouths of people. In addition, this term also has Limitation of Meaning which is always expanding and / or change, tends to make people interpret as biased, and highly subjective. Probably, You've just guessed that this term is, Beautiful!.
Must be understood first, in terms of disambiguation, beautiful is an adjective used to describe things as possessing beauty (Wikipedia-beautiful). Meanwhile, beauty is an aesthetic phenomenon. So it should be, up here it was clear about What exactly is meant by the term beautiful?. But why is still much debate about the term beautiful.
As a reference, the term beautiful in fact have much in common with terms such as: admirable, alluring, angelic, charming, classy, cute, dazzling, delicate, delightful, divine, elegant, excellent, exquisite, fascinating, good-looking, gorgeous, graceful, handsome, ideal, lovely, magnificent, marvelous, nice, pleasing, pretty, radiant, ravishing, refined, resplendent, sightly, stunning, superb, symmetrical, well-formed, wonderful and much more (Beautiful synonyms at Thesaurus.com). Of those synonyms, can be taken a basic meaning that term beautiful and its synonyms always leads to something good, better or best. Or something that has good value.
Compute...,How many synonyms are there?, then just add them with "Much more". So quite clearly that, Beautiful, is a term that has so much synonyms. And this is what is meant by: has Limitation of Meaning which is always expanding and / or change, as has been mentioned at the beginning of this beautiful post.
Then why do people interpret the term beautiful with biased? Because, the term beautiful-self has very much synonymous terms, so that, each term has no significant difference with any other terms. As simple example: "She's really beautiful...!" compared to "She's really gorgeous...!". It is very insignificant, is not it?, and the factor that can distinguish clearly is: Feel!.
Furthermore, Feel is clearly a very individual thing, in the sense of depth, something that is highly subjective. Of course, Each person's feeling is highly different. And a thing that could clarify or differentiate the meaning of term beautiful with very significant, is a word (or term) that follows it. Or called a postposition, which then form a phrase.
And finally, the phrase Beautiful Face with phrase Beautiful Woman is clearly different. Beautiful Face is more specific than Beautiful Woman. Beautiful Face is something Visible, while Beautiful Woman is something Visible but could also be something Invisible. Simply put, Martina Navratilova is a Beautiful Woman, because of her superb accomplishments (Invisible) as a female tennis player, while Aishwarya Rai is a Beautiful Face because of her fascinating eyes and well-formed face (Visible).
Do not be surprised if Martina Navratilova (or a kind of) who is a Beautiful Woman, does not appear here. In short, She is not a Beautiful Face.