Subject: Big-eyed cute cartoon little boy sitting on soft fluffy clouds, holding a bubble wand and blowing bubbles; inside the largest transparent bubble is a three-dimensional gradient number "61" shape with an inflated texture, and there is a little boy standing in front of an amusement park with his arms open happily in the bubble; other small bubbles floating dispersedly contain cartoon little boys in different states: playing sand, boating, and flying a kite respectively. Scene: Dreamlike scene high above the clouds, background is clear sky high with fluffy marshmallow-like clouds; inside the largest bubble is a fully-equipped children's amusement park scene, and the other small bubbles respectively correspond to children playing scenes on a beach, a lake, and an outdoor countryside. Style: 3D cartoon style, Pixar animation texture, round and cute figures, full of childlike innocence and healing feeling, fine modeling, all elements have soft edges without sharp corners. Color palette: Overall bright and fresh macaron tones, based on light sky blue, paired with soft and sweet low-saturation colors such as light pink, goose yellow, light purple, and light green, providing a soft and comfortable visual effect. Lighting: Bright and soft natural sunlight on a sunny day, light is transparent and even, transparent bubbles have iridescent reflections and a see-through effect, figures, clouds, and number shapes have natural soft light shadows, no strong light-dark contrast overall, warm and comfortable lighting. Composition: Vertical composition, visual focus centered slightly upper, the little boy sitting on the cloud in the lower right corner as the foreground, the large bubble in the center as the core visual focus, other small bubbles scattered around, distinct overall layout, sufficient white space, and comfortable visual display. Purpose: Vertical festival promotional poster, suitable as vertical material for brand festival promotion, with a relaxed and healing atmosphere, adapted for mobile communication display.