Other people who have set their module image to HEAD version (default) will see your newly uploaded image.
HEAD means: always show the newest image.
If they switch to an older version it will stick there, newly uploaded images will not affect their racks.

Is there a way to set the current module image to something other than HEAD even if someone wants the current default image? (So that a rack isn’t following the HEAD image, and doesn’t update when a new image is uploaded.)

Seems like this would maybe make sense as the default behavior. Rather than setting the module image to HEAD by default, just set it to whatever the current default image is, but stick with that image permanently.

To use an example, if I add a module to a rack with, say, a silver panel as the default and only image, then that’s probably the version of the module I own. If someone uploads a black panel later, I probably don’t want my rack to get updated with the black image. Seems like there’s no way to do that now, unless I re-upload (duplicate) the silver panel image and select the old version when adding the module to a rack, which would be a bit silly.

It’s always a little weird to come back to a rack after a few months and find out a couple of the module images have been switched out to a version I didn’t originally have in the rack and don’t actually own.