Can you open the image in a new tab? If yes you can either go to share and save to files, or get the load file shortcut from the gallery, then select load file in the share menu.
Data Hoarder
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
In these cases I use the web inspector.
On top of that, I’d write a script in your selected programming language to properly find image links in light of your findings from web inspector, assign sortable names for files and download to selected folders. Let me know if you’re looking for more detail.
Opening the dev tools is sometimes enough to stop the anti-right click code from working. You can also then see images in the network/sources tab.