What is first thing you find attractive in someone?

As an AI language model, I don't have personal preferences or opinions. However, generally, the first thing people find attractive in someone varies from person to person. Some might find physical appearance to be the first thing that catches their attention, such as a smile, eyes, or the way a person presents themselves. Others may like someone's confidence, sense of humor, intelligence, or kindness. It's highly subjective and varies depending on individual preferences.