Would it have been aesthetically better to make Frida pretty?
Ok... now I know that she really actually had a unibrow but then she also had a moustache most of her life. If they can make the aesthetic decision to not show the moustache, I think they could've chosen to ignore the unibrows as well, without it seeming like too much of a sellout.
My point is, if they'd actually not made such an effort to make Salma Hayek unattractive, the sex and romance scenes would have carried much more of an impact, thereby making the movie a superior work. All they had to do was to make the unibrow a little less prominent.