When you look at the above Ramsey portrait what you notice first is how poorly Ramsey portrayed the human form. Look at her neck, her shoulders, if he painted her lips a little thick it's nothing compared to how he thickened her neck and distorted her shoulders. Using this artist as the "true" representation is a tenuous position.
I didnt say Ramsay is the most accurate. But if you use only him, you could make the argument.
New one drop rule: an ancestor of color 15 generations back ( or the possibility) requires portrayal of the individual as a person of definite darkness.