Your goal as an author is to "Be Specific" in your novel: A clarion call to all creative writers as you pull your readers into the "Fictive Dream" of your book. That's the reason description is considered an art form. Description is simply a portrayal in words, of something that can be perceived by the senses.
Writing Tip: Your objective is to use sensory language: sight, sound, taste, feel, etc. It must be vivid. For example, keep a Descriptive journal, where you keep your writing exercises. One exercise you can do: observe and then describe the event in vivid words. Your writing must be concrete or vivid; add specific details, show sensory images, etc.
For more information on description, purchase Jumpstarting Your Inner Novel:
https://www.amazon.com/Julius-Thompson/e/B002BLUCGS
