Hi Yvonne,  we have had a similar idea to this recently, and I’ve been looking at lots of other portals to see if someone has done something similar. 

I have found Seine Ouest’s portal: https://seineouest.opendatasoft.com/explore/ and Digital Wallonia’s:  https://digitalwallonia.opendatasoft.com/explore/

Where they have used a custom Catalog card to show an image on their cards if certain conditions are met. I think it should be possible to do this with the “visibility” field for each dataset.

This isn’t something we’ve actually tried yet, so I can’t confirm if it works or not. If you do this, please let us know how it goes. 

thanks ​@matthew.parry - this looks like it would be a good solution.  Do you have any suggestions on how we could include a marker at the Title level (maybe between the dataset title and the “edit” button) or on the Information tab?
 

I don’t know if it is possible to edit the dataset pages themselves - I think the only thing you could do is to fill in the metadata field for only those datasets where you want it to show up. You may also be able to do something with the HTML mode for filling in the description box.