Leonardo da Vinci

This is a female face, drawn by Leonardo da Vinci. He's one of the greatest artists to ever live, so picking one of his pictures may have been cheating? But regardless of who drew it, you can see how carefully the details on the face have been done. His shading really gives the picture great depth and realism. He has an amazing grasp of the use of line; you can see along the curve of the woman's face how the lines take into into account the bone structure of her cheeks.