It's a list of pictures - but of what?
It's especially true of photographs but the need to rename groups of files to a more consistent or informative pattern exists for other documents and presentations too.
In Mac OS it's possible to do a simple find replace - select the files and then right-click if you have a proper mouse or control-click otherwise and choose "Rename" you can simple text replacement e.g. you might replace IMG with Avignon and keep the sequence numbers. You can do more complicated formatting and naming too.
The best way to experiment is to create a folder of files and have a play with the surprisingly powerful options.