Sensory detail in a paragraph could include, for example, a description of the sound of heavy boots hitting the floor of the hallway as a person walks. This illustrates the paragraph with sound, evoking the sensation of hearing.
Sensory detail is any kind of detail added to a scene that illustrates a complete scene for the reader through any of the five senses. The five senses are sight, sound, touch, taste and smell, and not one of them is more important than the other. All can be used to better engage a reader. This kind of added depth awakens the reader's imagination and brings him or her into a story much better than a simple description of events and places.
For example, if the writer is describing picking apples, merely writing, "They picked five pounds of apples at the orchard" does not fully convey the scene. Describing what the orchard might have smelled like, how crisp the air might have been, whether the ground was damp, whether the sounds of children playing could be heard in the background, and what color the apples, trees and sky were are all good options for a writer hoping to enrich the story and paint a more vivid picture.