The king wanted to parade his wife before the drunken friends. You know, we still do a bit of that today. Too often men value the appearance of women rather than their character. Even in Barby dolls we make a statement. The good looks are the highest value.
Good looks are fine.
There's nothing wrong with beauty. Men and women should honor each other, though, for value, for integrity, for Christ-likeness, for industry. You should choose a wife with your ears first and then your eyes. Beauty is great, but character will last. Now this request places the wife in a difficult position.