Here’s the trick: let the Highland cow cut through all that plaster. Bathrooms and cloakrooms are usually the flattest walls in the house, and this one gives you something to actually look at. The warm brown coat and copper bath lift a cool, tiled room without adding clutter, and the joke lands quietly rather than shouting. Hang it opposite the bath so it’s the first thing you see, or above a towel rail or loo-roll shelf in a small cloakroom. Pair it with painted panelling, chunky cotton towels, copper or brass taps and cream ceramics. Don’t bury it behind a shelf of bottles, and skip the busy patterned wallpaper it needs a plain wall to be funny. As a canvas the soft, matt surface keeps the whole scene warm and low-glare.