Two approaches. One: step back and include vast architecture, empty space, or landscape. Your subject becomes a figure in a world - small, contextualised, dwarfed. Two: move close and let the human fill the frame entirely. No context. Just face and expression.

Both say something different. The first is about the world. The second is about the person.

Watch for: accidentally landing in the middle - subject not small enough to feel dwarfed, not close enough to feel intimate. Commit to one or the other.

The point: how large your subject appears in the frame is one of the most expressive choices you make.