מדבר שקר תרחק

They further taught:
Shin: Falsehood [sheker]. Tav: Truth [emet].
Why are the letters of the word sheker adjacent to one another in the alphabet, while the letters of emet are distant from one another? That is because while falsehood is easily found, truth is found only with great difficulty. And why do the letters that comprise the word sheker all stand on one foot, and the letters that comprise the word emet stand on bases that are wide like bricks? Because the truth stands eternal and falsehood does not stand eternal.

§ The Sages taught: How does one dance before the bride, i.e., what does one recite while dancing at her wedding? [17a] Beit Shammai say: One recites praise of the bride as she is, emphasizing her good qualities. And Beit Hillel say: One recites: A fair and attractive bride. Beit Shammai said to Beit Hillel: In a case where the bride was lame or blind, does one say with regard to her: A fair and attractive bride? But the Torah states: “Keep you from a false matter” (Exodus 23:7). Beit Hillel said to Beit Shammai: According to your statement, with regard to one who acquired an inferior acquisition from the market, should another praise it and enhance its value in his eyes or condemn it and diminish its value in his eyes? You must say that he should praise it and enhance its value in his eyes and refrain from causing him anguish. From here the Sages said: A person’s disposition should always be empathetic with mankind, and treat everyone courteously. In this case too, once the groom has married his bride, one praises her as being fair and attractive.

The bride as she is: And if she has a blemish, they are quiet and they do not praise it. And also (another possibility is) they praise her with something pleasant that she has - for example, [he praises her] about her eyes or her hands if they are beautiful. And Beit Hillel says that you praise her altogether, as when we mention that which she has to be praised, it implies that the rest is to be denigrated.

You comment to her based on her actual beauty and grace

Because whatever is done to promote peace it does not violate דבר שקר תרחק (Ritvah).

We can explain Beit Hillel's position that one should comment on all of these things even if they aren't so good, just like you compliment a bride even if she doesn't really deserve it.