To display an avatar or author photo next to blog article author names or comments, simply create an account associated with your Shopify account email and upload the image at Gravatar.
This is a free service and is required to automatically show an avatar or author photo on articles and comments within your Shopify site.
Note that you will need to create a separate Gravatar account for each author and that the email addresses used for the Gravatar account and Shopify login must match exactly.
It's also important to note that updating the user image in the Shopify admin does not affect the article and comment avatars.
For details on how to update the biography text that appears next to the blog author image, see this article.
