Everybody's art is different some people may be about something that has happened to them in their life and they dont know how to talk to people about it so they tell the story through art. Other people art might be a picture or just splats on a piece of paper but it is still art.
On Britain's got Talent last year a lady called Kseniya Simonova told the story of what happened to princesses Diana but she didnt tell the story with words she drew the story with sand. She showed you the story with pictures rather than just telling the story in words.
Other people might use art to tell people how they are feeling if they can't find they can't find the right words to say.
Some people just think art is a drawing of a picture or splats of colour on a paper but if you look closely you might just find it's telling you a powerful message.