Delta

The difference between an artist and a craftist is that the former must have a mental illness. It’s what makes their work interesting. Technically, both can be just as competent as each other, but the craftist is just too sane to be interesting.

Note carefully though, your artist can’t be completely bonkers or else they can’t viably pretend to be sane, which is a characteristic hallmark of their artistic mental illness. Usually, laughably so.