Centering works when it best supports the story or visual effect of the image. Composition "rules" like the rule of thirds are guides, not requirements, and many strong photos break them intentionally.

A centered subject can feel natural or purposeful when the scene suggests a direct, symmetrical point of view. In the example discussed, the centered framing may help create the feeling that the viewer is looking from a mirror or medicine cabinet, which makes the composition part of the narrative.

Also, even if the body is centered, the true focal point may not be. In that example, the face and eyes still sit near an upper third line, so the image can retain some of the balance associated with rule-of-thirds placement.

In practice, center the subject when it strengthens the concept, symmetry, or viewing perspective. Place the subject off-center when that better adds movement, tension, or emphasis on the surroundings. The best choice is the one that serves the picture’s story most clearly.