Expression in a photograph can come from a face, a gesture or the relationship between shapes. Start by describing the visible moment before assigning an emotion to the person or scene.
Compare gesture and context
A close view may isolate a revealing movement, while a wider frame may explain why it matters. Consider both. Watch for background elements that compete with the gesture or change how it is read.
When photographing people, make room for their comfort and participation. A thoughtful sequence can show a range of moments without reducing a person to one expression.