Create a wide western poster for the "Cowgirl Coach Division." Multiple cowgirls on horseback charge across an open field, leaving a trail of dust behind them, with cacti and mountains in the background. The sky is a vibrant mix of orange and pink as the sun sets. "L'IMMERSION COMMENCE !" is displayed at the top in bold, eye-catching letters, while "Cowgirl Coach Division" is positioned in the bottom right corner in a handwritten, rustic font, emphasizing the community and unity of the group.