render this bathroom with a calm spa like atmosphere inspired by a japanese retreat apply a seamless light beige microcement finish only to the walls that do not have tiles including the bath surround seat ensure the microcement has a continuous matte texture with subtle tonal variation retain the green tiled walls and give them a subtle gloss finish with soft realistic reflections not overly shiny keep the bathtub in a matte white finish and fill it with clear still water with natural reflections introduce soft diffused natural light entering through the windows creating gentle shadows and highlights add a light foggy or steamy atmosphere to evoke a tranquil spa ambience while keeping all architectural elements clearly visible all metal fixtures and fittings to be finished in brushed gunmetal with accurate material response muted soft reflections ensure overall photorealism with balanced exposure natural light falloff and a warm serene palette
