Just a little icon option I need

Luv the Gallery plugin – I’ll be using it to display my artworks – What I would like is one additional option against each individual picture. The ability to isert an icon (widget?) that indicates the picture is for sale (not all pictures are for sale)which, on clicking, takes the viewer to the relevant page on the 3rd party auctioneer site that handles my work (or Ebay for small works). If possible in a new window.

I guess it can be done manually, its just that I don’t have the know-how.

The site is under construction – nothing to see yet
mervynbeamishartist.com

https://www.ads-software.com/extend/plugins/gallery-plugin/