Generate a realistic portrait image of a young British girl, titled Miss, with a gentle and innocent expression, sitting in a elegant indoor setting, surrounded by subtle hints of royal heritage, with a few delicate family heirlooms or symbols in the background, representing Sienna Elizabeth Mapelli Mozzi, the daughter of Princess Beatrice of York and Edoardo Mapelli Mozzi, with a soft, warm lighting and a serene atmosphere, in a traditional British portrait style.