If you have set your article layout to the Two-column View, then your Authory page will look something like this, with each article displaying a small thumbnail image:

The One-column and List View also show a thumbnail. You might want to change or, if there is none, add a thumbnail image for an article.

Luckily, that's rather simple: Go to the full text view of the article in question, then click the "more" icon in the top right corner and select "Preview Settings" from the dropdown menu:

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