Revision:
Probably re-exported at different compression settings.
Filesize increased by tenfold and the reflections in her eyes and on her tail are much sharper.

GabrielWB said:

Revision:
Probably re-exported at different compression settings.
Filesize increased by tenfold and the reflections in her eyes and on her tail are much sharper.

I think you misunderstood what revision is.

This tag should not be used unless there is a visual difference between the images. Images that differ only in resolution or compression level are duplicates, not revisions.

NekoAria said:

I think you misunderstood what revision is.

The artist's commentary has led me astray.