First, consider where it is to be displayed. Most importantly, what lighting it will receive. Lighting makes a dramatic difference in the presentation of any artwork.
Some photographs work best with their own light source (like a small spotlight) to highlight the image. For example, I processed and printed one of my photographs, Desert Moonrise with the intention of the photo having its own dimmed spotlight focused on it. In another photograph, The Flow, I have printed it on a cold press paper and placed in more diffused light where the subtleties of its pastel coloring show.
Different images and the material they were printed on make a big difference in how they appear to the eye. I have photos that look very different in the afternoon light than early in the morning – I appreciate this in some photos. In one of my spaces in particular the late afternoon sun cuts a swath of light across the photo, changing its mood over a short time. Sometimes this changing light reminds me of the varied “looks” I have seen in the place the photo was taken.
As with most art, the classic rule is to hang the center of the piece at 57” off the floor, or eye level. When hung over furniture, typically hang about 6” above the furniture.
If you remodel a home or office, I would strongly encourage you to consider strategically placing focusable lights to highlight your art.