Consider the relationship between any strong vertical lines and the shape of the portrait. When a background element is visible, consider whether it adds context or simply shapes the composition.

A person featured in a gallery portrait
A portrait presented in sequence
A portrait in a series of figure studies
One view from the collection
A portrait composition selected for display
A featured view from the gallery
A gallery image featuring a person
A gallery selection
A portrait image for a closer view of the subject
From the portrait collection