One of the best tips for capturing a person's personality and expression in a portrait is to pay attention to their eyes.
The eyes are the window to the soul, as they say, and they can reveal a lot about the mood, emotion and character of your subject. When you take a portrait of someone, try to focus on their eyes and make them sharp and clear in the photo. You can also use different techniques to enhance the impact of the eyes, such as using a shallow depth of field, creating catchlights, or using eye contact or gaze direction. By focusing on the eyes, you can create a more engaging and expressive portrait that tells a story about the person you are photographing.