Contrast

this painting by Vincent Van Gogh called Plain at Auvers is a great representation of contrast. Contrast is the arrangement of opposite elements like Light and Dark or rough and smooth. if you look at the white arrow it shows a very dark sky.
Van Gogh made the sky very dark to contrast the light orange plains as seen in the black arrow. if you look at the black arrow it shows how light the color of the plains are but also the rough texture. you see multiple lines making leafs and hay. compared to the smooth sky that are just strokes of grey paint. Van Gogh work usually has a lot of contrast