While not a "soundproof" panel, a high-quality pink floral mural from https://costacover.com/col... provides a critical layer of "visual and acoustic softness." Hard, flat paint reflects sound waves sharply. The subtle texture of premium wallpaper helps break up those waves. More importantly, the organic, non-linear shapes of petals and leaves reduce "visual echo." It makes a hard, "reverby" room feel psychologically quieter and more grounded