"Transform a photo with a Halloween theme by realistically enhancing the surroundings around the little girl. Envision a detailed Halloween-themed decor, incorporating elements like spooky trees, jack-o'-lanterns, and eerie mist. Ensure the atmosphere is both festive and realistic, with attention to lighting and shadows to seamlessly blend the Halloween elements into the existing photo. Capture the essence of the season while maintaining a natural and convincing integration with the original image. Please note not to modify the character in the photo, focusing solely on the Halloween-themed background."