Animate the 13-year-old Black girl in an ultra-realistic, smooth, and expressive manner. She is sitting cross-legged on her bed, gently strumming her acoustic guitar while singing in a rich, soulful R&B style. Her voice flows with smooth, emotional runs, subtle vibrato, and deep, heartfelt expression. Her facial expressions should reflect deep emotion and passion for the song, with subtle lip-syncing that perfectly matches the romantic and calm melody. The movement of her fingers on the guitar strings should be fluid and realistic, while her curly hair slightly bounces with her natural head movements. The warm evening light should subtly shift as if the sunset is progressing, and the fairy lights in her cozy room should flicker gently, adding depth. Ensure that the animation feels immersive, cinematic, and lifelike, with natural lighting and soft depth-of-field focus, maintaining an 8K UHD quality. The overall mood should be intimate and heartfelt, with smooth, expressive motion that makes her performance feel alive and deeply personal.