Look at the scale of the subject within the image and how it shapes your first impression. Consider what changes when you shift your attention from the subject to the arrangement of the whole picture.

A person in a frame from the portrait series
A frame from the gallery
A portrait appearing in the gallery series
Included in the photo gallery
A gallery image framed around a portrait subject
A featured image for closer viewing
A composition built around a portrait subject
A portrait to view within the collection