If you use your Instagram profile for a insta zoom brand or business, keep your profile picture consistent with your logo or brand colors. This helps with recognition.
If you have a personal profile, use a picture of yourself that reflects your personality. Smile in the picture to convey a positive aura.
Change your profile picture occasionally to show freshness. This can be particularly important if you have undergone a significant change in appearance or your brand has a new logo.
Experiment with different profile pictures and ask friends or colleagues for their opinions. Sometimes a fresh outside perspective can be helpful.