Single Point of Interest
This principle is so darn hard for those new to mobile photography, but it is so important! What you’re trying to create is a single point of interest in the photograph. Your goal should be to provide a natural path for the eye to browse the photo and fixate on what is most important.
Many photographic landscapes have way too many competing points of interest… so many that, as often is the case, the viewer has no idea what to look at.