Here's why:
* Subject's Shape & Pose: A wider subject or a pose that emphasizes horizontal lines might look cramped or unbalanced in a strict portrait format. A landscape format could allow more breathing room and better showcase the pose.
* Environment & Context: If the environment is important to the story of the portrait (e.g., someone in their workshop, a landscape setting), a landscape format might be better suited to include more of the background and give a sense of place.
* Compositional Elements: Leading lines, patterns, or other compositional elements in the scene might work better in a landscape format.
* Cropping & Flexibility: While you *can* crop a landscape image into a portrait later, starting with a portrait format limits your options for wider shots and incorporating more of the surroundings.
* Intended Use: Where will the portrait be used? If it's for a website banner or a social media cover photo, a landscape format might be required. If it's for a small framed print, portrait format might be better.
In short, consider these questions:
* Does the subject's pose benefit from a vertical or horizontal orientation?
* How much of the background do I want to include?
* What is the story I'm trying to tell with this portrait?
* Where will this portrait ultimately be displayed?
Sometimes breaking the "rules" leads to more interesting and compelling results!
Examples where landscape might be better:
* Environmental portraits: Showing a person interacting with their environment.
* Group portraits: Accommodating a wider group of people.
* Action shots: Capturing movement or dynamism.
* Portraits with expansive backgrounds: Using the background to create mood or context.
Ultimately, the best format for a portrait is the one that best serves the subject, the composition, and the artist's vision. Experiment with both portrait and landscape formats to see what works best for each individual situation.