Both beauty and intelligence can be developed given enough time. Each one must determine what type of investment they want to make.
Beauty is about what a society thinks is attractive at any given period. In ancient times it used to be that fatter women with whiter skin was preferable compared to skinnier women or darker skin. Today we hear about tanning, about diets, all sort of stuff. One can work on those aspects, for sure. Makeup, training (fit body), hydration, proper color (not too tanned and not too white-ish) etc etc. And then you also have clothes to accompany the set.
Intelligence is typically equated with accumulated knowledge, so someone knowledgeable can be confused for someone intelligent. Whatever the case, knowledge can be built upon given the appropriate time investment. And intelligence can be cultivated to higher levels for those who understand what it is and how they can improve it.