The central image consists of a 3x3 grid containing illustrations of eight distinct cartoon characters, with the central square occupied by the text "BT21". The characters are rendered in a bold, minimalist graphic style with thick outlines and flat, vibrant colors. Each character is set against a different colored background square, including deep blue, bright yellow, turquoise, dark grey, and orange, creating a colorful and dynamic mosaic effect.
The characters depicted represent the BT21 lineup: a light blue koala, a yellow-hooded puppy, a white robot-like creature, a red heart-shaped character, a pink rabbit, a group of three small brown bear-like figures, a white fluffy creature with a red scarf, and a lavender rabbit-like character. These figures are expressive, using simple shapes and emotive facial features to convey their unique personalities.
The entire grid is bordered by a bright pink field that frames the artwork. The overall aesthetic is playful and contemporary, characteristic of modern character design and merchandise. The clean lines and high-contrast color palette make each individual icon distinct and easily recognizable within the cohesive grid layout.