The key to description is
a. showing only the steps you consider important.
b. telling the reader how you would do something.
c. considering only what you think the reader already knows.
d. giving the reader enough detail to form a picture in his or her mind.

d. giving the reader enough detail to form a picture in his or her mind.

The key to description is to give the reader enough detail or information in order to form or create a vivid picture of the thing, place or scenario in his or her mind. The important features, the characteristics of the subject being talked about must be clearly described an emphasize in order for a description to be a success. It is only when the listener or the reader be able to draw the scenario out of the descriptions given will we say that the description is delivered well.