As a search output, I have the eventid and the relative users including a unique numeric id - in addition I have the unique numeric id as jpg name in a shared folder
eventid 1234 user s.brown \shared folder\s.bown.jpg or \shared folder\s.brown.bmp
Should be possible to display the events the users and the images in a dashboard panel?
see if this answers post will help as a starting point:
https://answers.splunk.com/answers/210473/how-to-embed-an-image-in-a-simple-xml-dashboard-wi.html
put the JPGs in Splunk and maybe you'll be able to token them? I've never tried connecting results with a JPG.
Yes, you can do it, but you will need to use some code... Take a look a the dashboard examples app as a starting point: https://splunkbase.splunk.com/app/1603/