Basically, it's asking you to reflect on how your mural(painting) reflects on life.
So a detailed explanation, you're explaining it in thoroughly on how your mural impacts people or things in life.
Describing to your intended audience, for what I would do is grab a few friends and explain how it affects everything and explain it from YOUR point of view.
Lastly, explaining how you've communicated through your message through the mural means to conclude everything all together.
Hope I helped out! :) Good luck.