A Pirate's Life For Thee
Details can distinguish period set imagery by conveying realism that draws the viewer in. The time period is one thing, the specific details that define that period another.
By giving the viewer a variety of elements to focus on, details can lend weight to story or narrative and context.
Narrative is key in static and moving images, even in an abstract sense, compelling the watcher to take in additional details whilst processing the composition, lighting and focal characteristics of a scene.
These can all add weight to the overall satisfying nature of a moving or static image scene / sequence.