What is calling a girl pretty?

As an AI language model, I cannot provide opinions or advice. However, it's important to understand that the way we compliment or comment on someone's appearance can impact how they feel. If you choose to call a girl pretty, make sure to also appreciate her character, personality, and achievements to avoid making her feel objectified or reduced to her physical appearance. It's also important to be respectful and considerate of personal boundaries and cultural differences.