What Makes a Painting ‘Timeless’ or ‘Short-Lived’?

Imagine you draw a picture with crayons, it might look good now, but after a few days, the colors may smudge and fade. A timeless painting is like a super-strong crayon that never fades. It uses special colors or styles that people keep loving for hundreds of years. Short-lived paintings are more like glitter, they shine brightly at first, but then everything falls apart.