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Mr_GT said:
Can you expand on that? What do you mean by objectively an improvement?
Only that the revised image didn't create any new problems compared to the original, and the image quality remains similar or better (resolution, file size, etc).

In cases where nothing was wrong with the original image, yet it was revised with new elements added, recoloring, and/or significant redrawing, those could fall under subjective changes where there may be artistic merit to keep both original and revised.

If the original and revised appear identical at quick glance, may as well keep only the new version unless someone identifies an actual reason why the original was superior. For the purpose of moderation in this case, I'd see no harm with a remove first, check later policy.