One of the things you want to establish with a bathroom space like this is comfort and relaxation. The candles are the highlight for me because not only do they make the space more ambient, but they also serve to make thing relaxing, and even romantic. When designing a bathroom space, you want to make sure that you have your aesthetics down, thus reflecting whatever it is you want to evoke. In this case the candles bring out several elements, whereas a more utilitarian bathroom might not have features such as this. It is really more about thinking about what design elements make your bathroom space work for what you need.