Generate a delightful birthday illustration celebrating a 16th birthday. The image should feature a golden retriever, donned in a party hat, sitting amidst a garden of lush green plants. The background should be awash with pastel colors and display 'Happy 16th Birthday' in elegant script overhead. Adorn the scene with flags and balloons, and include a special tag around the dog's collar that reads 'To my Niece', emphasizing familial affection.

Generated with these themes: 16 years old birthday, Golden retriever , Plants, and Niece.

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