In addition to what others have already said, even at Lourdes I think at one point Bernadette saw and/or heard "evil" in the river telling her (or the Immaculate) to leave. When the Blessed Virgin Mary looked in their direction, they left. (Something to that effect anyway).
Also, after St. Bernadette's visions at Lourdes, there were many claims of "visions" from others at the Grotto. Some were sure that they were seeing evil spirits "dressed in light". In any event, the Bishop only approved St. Bernadette's experiences as worthy of belief.
I don't recall ever seeing a painting of the evil one described and dictated to an artist by a visionary.