This image was likely not reposted to pixiv by the original artist.

Pixiv account of the original artist (account deleted): https://www.pixiv.net/users/2240517
Account that posted this (extant, put this post is deleted): https://www.pixiv.net/users/33332467

Another post of this account (>4000 favorites): pixiv #79855954
November 14 comment:

コメント失礼します*_ _)
この作品がメルカリで塗り絵として販売してる方がいましま💦見本としてカラーのこのままでも売ってるみたいです( ;´꒳`;)
許可等出されていたら申し訳ないです、失礼しました🙏🏻

Google Translate (probable TL corrections in brackets):

Excuse me for [my] comment * _ _)
It seems that this work is [included] as [part of] a coloring book [sold by] Mercari.💦 It seems that it is sold as a sample in color as it is (; ´꒳`;)
If permission was given, I'm sorry 🙏🏻