The idiom of this idiom is "beautiful", which should be categorized as a positive word.

Note:

A positive word is a word that has a complimentary, affirmative feeling. What kind of emotional color is given to the word is related to people's moral concepts, and when the moral concepts change, the emotional color of the word also changes. Broadly speaking, the characterization of positive and negative words is based on their original meaning. A word with or without emotional color depends on a certain language environment.