majestic unicorn galloping through a vibrant rainbow filled landscape in a captivating fantasy novel scene the ethereal equine

unicorn horse equine galloping running rainbow vivid colorful magical fantasy mystical nature outdoors field meadow grassland flowers landscape scenic beautiful digital art painting conceptual ethereal dreamlike enchanted whimsical majestic graceful powerful elegant mythical legendary surreal composite creative imagination design artwork background scene novel creature fantastical steed wild prancing jumping leaping