A small, centrally placed watercolor illustration of two silhouettes on a train platform. One figure is boarding a train, while the other stands on the platform with an outstretched hand. Use muted, melancholic colors like soft blues and greys. The train should be partially visible, with wispy steam rising. Keep the background minimal and leave ample white space around the central image for text overlay. The overall mood should be somber and bittersweet, capturing the essence of a sad farewell."