With two big watercolour hydrangea heads, scale decides whether the bedroom wakes up. Go too small and the flowers turn into a smudge of green; go generous and the whole wall feels like a garden window. The greens here run from pale lime to deep leaf, so a flat white or off-white wall gains depth without gaining noise. Hang it above the bed or a low chest of drawers, roughly eye-level when you’re sitting. Pair it with pale wood, linen bedding and one stoneware jug of something fresh. Skip heavy patterned wallpaper behind it and avoid crowding it with dark, high-contrast graphics the soft edges need breathing room. On premium fine-art paper the watercolour washes keep their soft, absorbent edge.