A charcoal bathroom should feel like a quiet, candlelit spa — deep and calming, not gloomy. This palette puts a slate charcoal on the vanity, where a moody color earns its keep without swallowing the whole room. That’s the trick with dark shades in a small space: give them one strong surface to live on and let everything else stay light.
Around it, warm greige walls and a soft soft linen trim keep the room bright and airy, so the charcoal has somewhere to breathe. Both have a gentle warmth to them, which is what stops the charcoal from feeling chilly next to your tile and mirror.
To finish, walnut brown brings in real wood warmth on open shelving or a stool, and a single hit of burnt umber on the door or a framed niche gives the eye a deep place to land. Use that darkest umber sparingly — one small surface is plenty.