I need help sizing art for my guest bathroom. I think it should be centered over the towel bar, (which is off center so that the shower door doesn't hit it when it opens out). The towel bar is 31" long. The brown paper hanging above the towel bar represents a 30x30 frameless canvas that I like, but if it's wrong for the space, I won't purchase it. Is it too big? Should I go with something closer to 24x24, or a rectangle? If rectangular, would portrait or landscape orientation be better for the space? The ceilings are 9'7", and the towel bar is mounted 4' above the floor. Thanks in advance for any advice!