Bio: Because description is a mode of expository writing which is relied upon in other expository modes, we sometimes find difficulty in imagining a purely descriptive essay. In a narrative, for example, description can make the setting of characters more vivid; in a process paper it can insure that the audience understands the finished product. Regardless of how we use description, it is easy to see that it strengthens an essay considerably.PrinciplesStudents often ask, "But how do I write a purely descriptive essay? What's the point of description? What's so different about it?" There are three characteristics of a purely descriptive essay which are worthy of remembering.*a descriptive essay has one, clear dominant impression. If, for example you are describing a snowfall, it is important for you to decide and to let your reader know if it is threatening or lovely; in order to have one dominant impression it cannot be both. The dominant impression guides the author's selection of detail and is thereby made clear to the reader in the thesis sentence.