Act as a seasoned fantasy artist with 10+ years of experience in epic world-building. Create a highly detailed MidJourney image of a [medieval fantasy kingdom] under siege by a [massive, fire-breathing dragon]. The scene should take place at [dusk], with the sky painted in hues of orange and purple, reflecting the chaos below. The dragon should be perched atop the tallest tower, its wings spread wide, as it unleashes a torrent of flames upon the castle walls. Include terrified villagers fleeing through cobblestone streets, knights in gleaming armor rallying to defend the gates, and crumbling architecture with intricate Gothic details. Emphasize dramatic lighting, dynamic composition, and a sense of scale to convey the sheer terror and grandeur of the moment.