Liella! 2nd Anniversary Key Visual AI Image Prompt

Create a clean anime idol birthday/anniversary key visual with a four-member school idol unit in symmetrical stage formation. Square 1:1 composition, soft cream background, full-body centered, crisp cel-shaded anime line art, bright pastel colors, official character-art quality. Background: huge pale pastel typography 'Liella!' in light pink above and '2nd' in soft lavender-blue behind middle, partially obscured by characters, oversized, flat, low contrast. Characters: 4 teenage anime idol girls in coordinated color-coded plaid performance costumes with white puff sleeves, frilled skirts, wristbands, neckties, white socks, white sneakers. Use {argument name="unit name text" default="Liella!"} as large top background word and {argument name="anniversary text" default="2nd"} as large lower background word. Pose: front-center girl fully visible, kneeling low with hands on floor, bright red twin-tail hair, blue eyes, confident smile, pink-and-red plaid vest, pink skirt, magenta tie and wristbands. Behind: 3 other girls with intentionally anonymized faces using soft rectangular beige blur masks: left: long blue hair, blue plaid outfit, blue skirt, sitting wide side-lunge pose with both arms extended forward in rounded hand gesture; right: long blonde hair with white flower accessory, green plaid outfit, yellow skirt, mirrored side-lunge pose with one arm out, one bent; back-center: light brown hair, red plaid outfit, standing tall with both arms raised diagonally upward like cheer pose. Set front-center character identity as {argument name="front character" default="red-haired anime idol girl"}, with {argument name="left character hair color" default="blue"}, {argument name="right character hair color" default="blonde"}, {argument name="back character hair color" default="light brown"}. Costume: layered frills, plaid fabric panels in each color, small bows, fitted vests, white blouse sleeves, pleated skirts, colored wrist cuffs, simple white stage shoes. Skirts fan outward and overlap for star-like silhouette. Style: Japanese anime idol franchise illustration, clean white outlines, delicate shading, cheerful celebratory mood, no photorealism, no extra characters, no props, no watermark. Exactly 4 characters, 3 blurred face rectangles, only front-center face clear.