If there is a noticeable color contrast, see how it affects your reading of the portrait. Consider the visual weight of each side of the frame before deciding where the image feels balanced.

A portrait appearing in the gallery series
A view from the portrait series
A gallery portrait of a person
Selected for this portrait series
A gallery portrait viewed as a study of the figure
A frame for comparing first impressions
A person featured in the portrait collection
A frame to linger over