What physical differences are there between Buttercup and her parents in The Princess Bride?

In "The Princess Bride," Buttercup is depicted as a beautiful young woman with long, flowing hair and striking features, which contrast with her parents, who are described as farmers. Her parents are presented as more rugged and ordinary, lacking the refined beauty that Buttercup possesses. This difference highlights her fairy-tale-like quality, setting her apart from her humble origins. Additionally, while her parents are characterized by their hard work and practicality, Buttercup's beauty and grace elevate her to a different narrative role.