When displaying photographs as artwork in your home consider the photograph subject and size for clues of where and how to display them. Portraits work best in hallways, bedrooms and family rooms because they are personal and can be grouped together.
If the subject matter makes a bold impact consider placing it where you can see it from a distance.
You can tuck a more detailed photo into a cozy corner to create an intimate setting.
Wall shelves work great for displaying photographs too, use multiples sizes or create a rythmn with all the same size.