otaku_emmy said:
I checked, and the original image had been replaced by the revision. It was not two separate posts.

......

I know artists sometimes release two versions of an image. But that's not what happened here.
For the most part, we ignore how, where and when the artist releases works and what s/he chooses to delete or replace. We have our own system for organizing images. I think it's a bit unfair to delete a similar image just because the artist chose to replace the image instead of posting them separately.

If the differences are so minor that we wouldn't keep both and we can't really tell which one is better, we would just keep the revision. But otherwise, we chose the better version or keep both if both have their merits.