I seldom try to choose a single subject. I normally want the entire range of what the eye sees. So my images tend to be very wide angle and landscape cropped. I do try to eliminate distraction on the edges, but that is about all I do towards subject isolation. In this case, the subject was the Garden Wall at Glacier NP. It takes up the entire frame by itself. I wanted to see if this meets the definition of a single subject? I would personally prefer a colorful sky to go with it. All comments welcome and feel free to download and edit the image.