On this beautiful grassy field, four Cossacks appear to be joyfully playing some sort of game with a ball. Clad in their traditional high boots and loose clothing, two of the Cossacks are even on horseback! The scene is fun and boisterous, bringing to mind the lively nature of these brave warriors. To further illustrate this festive and vibrant atmosphere, you could try using bright and warm colors for their clothing as well as for the grass and sky, to clearly show their love for their homeland and their culture.