I've been on Furafinity long enough to come to a disappointing conclusion, and also to give advice suitable for any beginner. Absolutely any artist or commissioner can delete any of their art for no reason or even delete their page. So if you really like any art, download it to your device or, better yet, save it in the cloud storage. Because if you don't do this, there's a chance you'll lose this art forever. There are no exceptions to this rule. Don't assume someone won't delete anything, because that will cost you your favorite art, which you'll lose forever.
P.S. If you also liked someone's comments, take a screenshot of them; local might delete them later.

Wow, I got an watcher! I think if I try hard this year, maybe next year I'll have two, lol. Well, even if this guy pressed the button by accident, I have a lot more motivation now)