You look so good-looking.这句话对不对?

so good-looking

用so来修饰不太常见。但也有人用。

用副词修饰可能更好。

She's strikingly good-looking. 她非常漂亮。

来源：《牛津词典》

Their father was incredibly good-looking. 他们的父亲十分英俊。

来源：《柯林斯英汉双解大词典》