i can tell you with utmost honesty 🙂 that i've seen pictures of watson completely without make-up, and that she is definitely not anywhere near pretty, let alone gorgeous. she's just normal-looking - that's my opinion, what you people want to think about her looks IS ENTIRELY UP TO YOU.
if you want pictures of watson without makeup try google image search. you might be able to find some there but lately one or two have been taken down.
her old pictures were better [a la during early years], but i must say that lately her dress sense is getting worse. at times, she puts too much make-up [like rouge] and sometimes her clothing just isn't appropriate for the event she's attending. there were one or two incidences where it was fine.
about her bimbotic lines, i think that while it is unlikely they could've allowed her to affect the script in such a manner you must admit that it is still possible for cuaron to have allowed her to do so. without confirmation from the director or his co-ordinates though, mere speculation will have to do for the time being.
oo shall shut up now i sound like i'm typing a business document.