How big should art be above the fireplace in a living room?

Art above the fireplace should be large enough to fill the mantel width and reach a comfortable height visually—typically two-thirds or more of the mantel’s width and 30 to 40 inches in height. In a moody green room, bigger vertical art pieces add scale and drama, balancing saturated walls. Proper art size anchors the fireplace as a strong focal point without overpowering the surrounding space.