The selection of these details (and the omission of the others) helps to constitute and make the visual.
This is productive in two ways. Firstly, it suggests a set of relationships between, and stories about.
Secondly, it establishes a (usually temporary) hierarchy regarding the potentially visible; that is to say, whoever took this photograph or observed this scene decided (at a conscious or unconscious level) that this content within this space at this time was interesting or worthy of attention.
In other words, they made an evaluative decision.