Hello there,

Yeah it is possible, all you need to do is,

1. In your site Backend > EasyBlog > Settings > Layout > Post Covers > Listings Layout > Enable 'First Image as Post Cover'
This will display the first image from the user's blog post if they have posted any.

2. In your site Backend > EasyBlog > Settings > Views > Frontpage Listing > Posts > Enable 'Show Post Image Placeholder'
Also enable the 'Show Post Image Placeholder' for the Single Author, Single Category, Entry Post, and Single Tag tabs.

3. Finally, you can have your custom image in the placeholder by template override. But, remember to save your custom image with this name 'placeholder' and save as 'png' image extension :

JoomlaFolder/templates/YourCurrentTemplate/html/com_easyblog/images/placeholder.png