Faux windows solve a decorating problem in a space with no windows. Yes, normal wall art can spruce up a room, but cannot add the ambience of having a spectacular view from a window.
Several years ago the college I was teaching at moved several miles to a new campus. While many were excited to have a new building, there soon was an outcry because the faculty offices were to have no windows. Soon, a few of my colleagues discovered art designed to have the appearance of windows. In some sense a faux window can be better than a true window in that one can choose the image. Even better is one can change the wall art, thus giving the appearance of a totally different setting. One can have a beach view for a period of time, then a mountain view.