A cheerful, whimsical studio portrait of a young woman holding or interacting with a large, bright yellow balloon against a clean studio backdrop. The yellow balloon is the primary visual anchor — oversized, perfectly round, and saturated in a sunny, optimistic yellow that pops against the neutral background. She holds it by its string at various positions — perhaps in front of her face peeking over it, beside her head as a companion, or letting it float slightly above her reach. Her expression is playful and joyful — a genuine smile, bright eyes, and a sense of carefree happiness. She wears a complementary outfit — perhaps white, light blue, or another color that harmonizes with the yellow without competing. The studio backdrop is clean white or soft gray, creating maximum contrast for the balloon's color. The lighting is bright and uplifting: a large octabox overhead and slightly forward, providing even, flattering illumination with minimal shadows — a high-key setup that matches the cheerful mood. Shot with a Nikon Z8, 85mm f/1.4 at f/2.8, with the balloon rendered sharply against a slightly softened background. Bright, playful studio photography, photorealistic, 8K resolution.