a young man with short black hair, and a refined expression, wearing a stylish casual shirt with rolled sleeves and a subtle smile, he is gently hanging pastel-colored paper garlands or balloons, mid-motion with arm raised, a birthday party space softly lit with natural afternoon light or warm fairy lights, background includes streamers, ribbons, and a partially decorated cake table, still-frame composition, cinematic angle, focus on his graceful pose and serene expression, soft shadows, warm color palette, anime style with semi-realist