For what it's worth, artist admitted that he made an error regarding her headwear and posted the fixed version on Pixiv... one month later (in the same day Leksa posted this one, in fact). It's also way larger than the Twitter version and also in PNG, so you won't see the artifacts when zooming in.
Edit: Oh, he also provided the "L2D version" on the Pixiv source.
For what it's worth, artist admitted that he made an error regarding her headwear and posted the fixed version on Pixiv... one month later (in the same day Leksa posted this one, in fact). It's also way larger than the Twitter version and also in PNG, so you won't see the artifacts when zooming in.
Edit: Oh, he also provided the "L2D version" on the Pixiv source.