Description of actual words, written or spoken, used to tell a story and images or pictures come under the category of.

The correct option is Discourse.

In narratology and literary theory, a story is analyzed in terms of two main components: the "story" (or event/content) and the "discourse" (or expression).
The story refers to the actual chronological sequence of events, characters, and settings—what happens.
The discourse refers to the actual words, written or spoken, used to tell that story, as well as the images, pictures, or medium used to represent it—how the story is told.
Therefore, the description of actual words, written or spoken, and images or pictures used to tell a story falls directly under the category of Discourse.