In Introductory Creative Writing, our students were asked to describe in detail a setting of their choosing. This was a great example of successful description:
Grace L, 8
Yesterday, Ingrid went to the beach, and the sun was shining on the sand. She put down her umbrella and mat, and laid it on the soft sand. Under the sun, the sky blue sea felt warm, so she decided to swim for a while. Then, she came back up and laid on her mat and started to read a book. There were kids building a small castle, while other families were swimming. Also, some kids were playing volleyball.
Notice how Grace uses several senses to describe the setting, and includes details about how people are reacting to the setting. Great job!