Here is a high-quality, coherent, and stable diffusion prompt based on your input:

A 12-year-old petite fashionista with bright blue eyes and fair skin poses in a vibrant pastel-colored off-shoulder blouse with ruffles and a small bow at the collar. Her hair is styled in soft waves, held back with a matching lavender headband, as she playfully holds her skirt and gives a cheerful smile. She's standing with one hand on her hip and the other holding her skirt, against a bright and cheerful park background featuring colorful flowers and toys. The scene is captured in hyperrealistic 8K resolution, with HDR and UHD quality.

This prompt combines the various elements you specified, including the girl's age, appearance, clothing, accessories, hairstyles, setting, and style. It also incorporates engaging angles and emphasis on highlighting her playful and stylish nature.

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