Why it matters.
Decide what the viewer sees first and what belongs in the frame.
A closer look.
Subject placement, frame edges and surrounding space are useful choices. Guides such as the rule of thirds can prompt alternatives to a habitual composition.
Picture this
Make three frames of the same subject: centred, off-centre and close-cropped. Compare what each emphasises.
Keep in mind.
Composition guides are starting points, not requirements. The intended picture determines whether a choice works.