"Fixing" someone's art?

I have seen some controversy about "fixing" other people's art. Examples of this are: adjusting a character or oc's body size, the skin color, etc.
Some people have been editing other people's art or characters so they look black, such as genshin impact characters.
I want to know your opinion on "fixing" or changing someone else's art, and whether you think that if there is no bad intent behind it, if it should be tolerated?