Note: I'm not familiar with juxtaposition but I'll do the best I can. Feel free to use it in it's exact words but I would paraphrase for safety measures.
Answer:
The sound of the crashing waves sung to ears of those that were left on the beach as the sun came face to face to the ocean. The sky; a song consisting the calmness of night sky blue and the (you choose) of the fading mango orange sun. The salty breeze soften until there was only a drop of the sun left for eyes to see.
Step-by-step explanation:
Is there a picture of a beach provided with the question?