If you were an artist and one of your published pieces or edits had an error - I mean something big, not like just a shadow - would you get mad or anything if someone told you that the thing you posted is wrong? Obviously that would happen privately
I’m afraid that if I tell people this they’ll get mad
yup! I don’t mind if someone told me there was an error, mainly because it doesn’t bother me, which may bother other people. But yes, I always notice errors that many people don’t whenever I draw!
If they don’t ask I wouldn’t recommend it.
If you do so decide to do this its best to do it privately and still be respectful of the piece. Artists work hard on their work so they would still like to be complimented and respected on something they create.