What Makes Good Game Art?

A really good cover is part of why I've been employed or like, or at least continuously employed in this business. So being a good cover artist means having a very keen eye for composition and value and contrast. And there's a lot of covers that I feel are quote unquote bad when they're just kind of a gray. You can't remember it. What was it about games? A cover should leap off the shelf and tell a story.