The image next to it is a photograph. The painting is blurry. The photo has clean hard edges. Both are images of a cathedral, yet both are very different from each other. Music can have clean, sharp edges like the photograph on the right, or it can suggest an image, like the painting on your left.
Impressionistic music has a hazy, rich, blurry quality to it.
It suggests rather than informs. It hints rather than states. Listen to the music of Debussy and Rave l. Their music paints a picture, but it's up to you to decide what that picture is.