Magnificent, detailed pencil drawing, half length portrait, (Leonardo da Vinci:1.6), contemplative expression, various sketches, notations, quill pen in hand, working diligently at his desk, wood paneling background, ambient natural light, soft focused, historical accuracy, graphite lead, delicate lines, rich contrast, intimate close-up, 900px x 600px, vintage parchment paper texture, 8K, incredible detail
(Leonardo da  Vinci:1.6), sketches at his desk. 