How do I update my Google Play artist image?

To change artist page profiles on Google Play Music, The artist will have to go through the Artist Hub.

To create an artist hub account:

Visit play.google.com/music/publish 
Sign-in with the Google account to which you would like your Google Play store page associated.
Search for your artist name.
If found, click the Select button next to your artist name.
You may be asked to provide a verification code to verify your identify. Go here to request a verification code.
Accept all the agreements and terms of service.
For more information on the artist hub, check out the Artist Hub Help Center here:

https://support.google.com/googleplay/artists/?hl=en#topic=2854405

For more information, reach out to [e-mail]