Oh, bit of an aside: I've been having HUGE issues with unused images being stored with my .blends, which show up whenever I'm selecting an image, like the image above.

The way to get rid of that is - according to Disorder66 on the BlenderArtists.org forum - to:

-- Start a new, blank Blender file (one with nothing in it)
-- [Menu] File > Append [Shift F1]
-- Locate the file you want to clean up
-- Select the  "Scene" folder
-- Select "Scene" and click the "Link/Append Library" button (upper-right corner)

At the top of the interface, next to the File | Add |Render | Help menu is a box that allows you to select a scene. (you now have two 'scenes' in your .blend). Click the X next to "Scene", which will delete the Current Scene.
Now you'll have Scene.001 which is your original scene that should be clean of the image references.

If you still have images that persistently hang on:

-- create some mesh and create a material for it based on an image texture
-- select one of the files you want to get rid of from that dropdown list (shown above)
-- hold down the Shift key and click the X to the right of the number (and the F and the tiny file folder)

Do this for all the image you want to get rid of, delete that dummy mesh when you've finished and then save the .blend file with a new name. Repeat the steps above (by Disorder66).

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

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