Generate an image of a mystical forest glen during twilight. The forest should be dense and lush, with tall trees reaching up towards the sky. The ground should be covered in soft, green moss, and there should be a small stream running through the center of the glen. In the distance, there should be a hidden waterfall cascading down from a cliffside. Use warm colors such as oranges, yellows, and reds to represent the setting sun, while keeping the forest shrouded in cool blues and greens to emphasize the mystery and enchantment of the scene. Add some magical elements if desired, such as fairies, unicorns, or other mythical creatures lurking among the trees.