This is a really cool master bathroom with arched windows. I have always been a fan of large windows in a bathroom space because they allow for a lot of natural light. There are two reasons why this is so great. The first is that it cuts down on your energy consumption and bill, thereby saving you money and helping the environment. It also just looks nice. From an aesthetics point of view when you have big windows it really opens up the space in a big way. The color scheme is also very soft and earthy, which also helps to lighten up the space.