* Wider Scenes: If the portrait includes a significant background or environment that's important to the story, landscape might better capture the context. Think of a portrait of a person standing in a vast landscape, for example.
* Group Portraits: Large group portraits often work better in landscape to accommodate everyone comfortably.
* Emphasis on Horizontal Lines: If the portrait features strong horizontal lines (a horizon, a long table, etc.), landscape can better highlight them.
* Creative Choices: Artists sometimes deliberately choose landscape orientation for stylistic reasons, to create a different feeling or mood. Breaking conventions can be a powerful artistic statement.
* Specific Compositions: Certain compositions lend themselves better to a horizontal presentation.
In short, the best orientation depends on the subject, the context, the desired emphasis, and the overall artistic vision. Portrait orientation is a safe default, but it's not an inflexible rule.