Formal:
* Una mujer hermosa: This is the most literal translation and is suitable for formal situations.
* Una dama hermosa: This translates to "a beautiful lady" and is also formal.
Informal:
* Una mujer bien bonita: This is a more common way to say "a beautiful woman" in everyday conversation. "Bien" emphasizes the beauty.
* Una mujer guapísima: This translates to "a very beautiful woman" and is also very common.
* Una mujer linda: This translates to "a pretty woman" and is a more casual way to describe someone's beauty.
More specific:
* Una mujer preciosa: This translates to "a precious woman" and suggests a special kind of beauty.
* Una mujer espectacular: This translates to "a spectacular woman" and emphasizes her striking appearance.
The best way to choose the right phrase depends on the specific situation and your relationship with the person you are talking about.