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breast_hold kantai_collection kentia pola_(kancolle) topless

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I think author re-saved it as jpg for smaller size.
The png version looks suspicious: it's almost same as jpeg version (in terms of jpeg artifacts) and only has slightly less noise around the edges.

And the url for the jpeg version matches with the date on pixiv (2016/05/26/03/49/31/) so I tend to believe the author didn't re-upload it.