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shenzi
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The preexisting is a JPG. This one is a PNG. This would be more ideal to keep.

Check formats, resolutions, file sizes, even check for compression artifacts before deciding on which image to flag.

Fortunately, admins have better judgement in deleting than some of you do in flagging. (But I've seen a few instances in which superior versions of images get deleted in favor of preexisting ones.)