I guess we could ask, what is the metric of greatness for art? Quality of work? Popularity? Is the artist who does something perfectly exquisite that profoundly

I guess we could ask, what is the metric of greatness for art? Quality of work? Popularity? Is the artist who does something perfectly exquisite that profoundly impacts anyone who sees it, but ends up only being seen by a small handful of people more or less great than the artist who's work is ok quality, and a bit inspiring, but is known to billions?