To create a peaceful effect in artwork, many artists capture the beauty of nature. Things like bodies of water and clear skies in paintings often convey a feeling of peacefulness. of course though, there are many other ways to get this result, it's all in the eye of the beholder.
Creating a piece of art to recreate/or create a sense of peacefulness could consisit of your mind. The mind is powerful and you could make anything. ;pchdbyhiiip