Requested feature overview description.
Option to mark favourite images in the thumbnail.
Example:
https://i.imgur.com/CxYe61J.png

Why would it be useful?
Easy way to see if you've already favourited a post or not directly on the search page without having to click on the image. Potentially for saving bandwidth.

What part(s) of the site page(s) are affected?
Search page, pools.

There's a metatag for that: favoritedby:leexis2 or -favoritedby:leexis2. Use these to search within or exclude your favorites. Same goes for other user names, and you can do the same with upvotedby and downvotedby, or you can use votedby as a catch all. But, this doesn't mean I'm opposed to this idea, I just don't know how much effort that would save.