Final answer:
The passage compares Paul's black-black hair color and his thin, disdainful nose shape to those of his family members, indicating the resemblance between Paul and Jessica is in hair color and nose shape.
Step-by-step explanation:
In the given passage, the physical features compared between Paul and Jessica are hair color and nose shape. The passage details Paul's face being oval like his mother Jessica's, with strong bones, suggesting a resemblance in bone structure.
His hair is described as black-black, like his father the Duke's, but Paul also has the browline of his maternal grandfather, who is unnamed. Additionally, the description of his thin, disdainful nose is paired with the shape of his directly staring green eyes, similar to his paternal grandfather, the old Duke.