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Explanation: Since you are treating the person in plural (they are beautiful), I hope do not have too close relations. In Russian we have two ways of behavior/treatment of a single person - you in plural (Вы, first char always CAPITAL) and you in single (ты).
So, you are the judge to decide whetehr you should apply Вы or ты.
If you wish to say to several persons (e.g., onthe same photo), please use "вы" (small first char).
If you wish to stess that this person is indeed very beautiful, you may write
Вы очаровательны (ты очаровательна), Вы очень красивы (ты очень красива), etc.
Note that everywhere you partner is female:-) Treatment of a male person treatemnt is slightly different:-)
I could give more help if knwo exactly your situation:-)
ttagir Local time: 04:15 Native speaker of: Russian, Tatar PRO pts in pair: 1025