Negative space entails using dead space around the subject, which comprises the positive space. It will keep the image from appearing too cluttered and emphasize the primary subject. When used properly, negative space provides a natural balance against positive space.
You, as the photographer, should not feel you must cram interesting detail into every square inch of a photo. This may confuse the viewer may and they will lose sight of the subject. You may also tell no story at all with such a hodgepodge as the purpose of the photo will be forgotten.
When framing your photo, adjust composition until you feel ‘balance’ has occurred between positive and negative space. Move subject(s) around. Reposition your camera rig. Try different lenses. Add light. Add shadow. Experiment till your photo feels right.