A good profile picture for messenger and Instagram should be a clear image of your face that is well-composed and easy to see. It's important to choose a photo that accurately represents you and your personality. Some people choose to use a professional photo for their profile picture, while others prefer something more casual or fun. Ultimately, the best profile picture is one that you are happy with and that makes a good impression on others. Just make sure it's not too blurry or pixelated, and that it fits within the dimensions allowed by the platform.