Displaying author avatar in articles

Hi,
This is not possible directly in Zakra. However, you can create a child theme and modify the theme’s behavior via the child theme: https://docs.zakratheme.com/en/article/how-to-add-custom-code-to-the-theme-using-child-theme-1ml5yot/

Furthermore, if it interests you, Zakra Pro has an option to show Author Box in the Posts:
https://docs.zakratheme.com/en/article/how-to-enable-author-bio-for-your-posts-pro-1xi5qgx/

Thanks.

You can override the zakra_posted_by function available in inc\template-tags.php file in Zakra theme.