Either random Google Images result, maybe even combined with not knowing that this show has fan art in the first place and thereby believing that all pony pics must be official.
Or they’ve deliberately picked an artist who has disappeared completely to avoid complaints and such.
https://en-gb.facebook.com/MyLittlePonyEspana/photos/a.295788063824543.70625.169793256424025/1582687571801246/?type=3
Archive: http://archive.is/PK81h
In fact, this region fan page is a repeat offender and rips fan art for Halloween and Christmas too.
Or they’ve deliberately picked an artist who has disappeared completely to avoid complaints and such.
I’m surprised that official sites are using arts made by fans.