This is just a screencap of the official Live2D skin. See around the 1:53 mark here. Huge tipoff when the source tweet only has 2 retweets and 12 likes.

I did try a few reverse image searches, but only came up with copies of it. Of course Danbooru threw no alarms. So I went with the Twitter userpage it was on. It just happens.

g3gen said:

I did try a few reverse image searches, but only came up with copies of it. Of course Danbooru threw no alarms. So I went with the Twitter userpage it was on. It just happens.

Maybe pay a bit more attention to the poster / source, no artist entry on danbooru is already a big red flag. This is not the first time you "accidentally" upload in game screen cap or similar stuff, creating wrong and unnecessary artist entry in the progress.