I'm looking for the title and author of a short story I read sometime between the late '70s and the '80s.
It's about a young couple who are curious about a neighbor with a peculiar behavior. I don't recall the specifics of this behavior. But the neighbor ends up being an alien that is appraising the Earth as a work of art.
Before leaving, the alien notes that the Earth is not a particularly inspired piece. But it is not completely worthless either and, hence, it will be spared destruction. One of the positives is the way living creatures get their energy (eating).