If it's a personal profile, use a picture that clearly shows your face. This creates a personal connection.
There is no hard and fast rule for this. You can change your profile picture if your appearance or brand changes. However, an occasional change can also arouse interest.
To temporarily hide your profile picture, you can delete it and replace it with a blank picture. However, please note that your profile picture will not be visible to other users during this time.
Clear portraits or well-designed logos are usually noticed best. Choose an image that best reflects your personality or brand.
This article explains the best instazoom methods and techniques to optimize your profile picture instagram.