Even though „Jesteś (taka) piękna” is perfectly valid Polish, I can’t imagine anyone actually saying it out loud (in a book or a film - yeah, in person - not so much unless you’re in a romantic after-sex, love-story situation lying naked next to her and smoking a cigar, looking her in the eyes). It just sounds extremely awkward and pompous. „Pięknie wyglądasz” (lit. you look beautiful) would be a way I’d personally go for.
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