I love picture windows. If you are able to get one into any of the design elements around your house then that is awesome. The reason I like them so much is that they add an incredible amount of natural lighting, and they generally give you a great view of your neighborhood or in this case the landscape. The shower in this bathroom design is also great, and I think using glass serves to make the bathroom feel larger. In fact, I would argue that using the picture window in the bathroom also makes the space feel bigger. The range of brown that they used is also a good choice.