Final answer:
The distinguishing feature of Pauline Breedlove is her limp due to a childhood injury.
Step-by-step explanation:
A distinguishing feature of Pauline Breedlove is her limp due to a childhood injury. Although the question provides details about her captivating smile, charming demeanor, striking blue eyes, curly hair, unique fashion sense, and extravagant jewelry, none of these are distinguishing features mentioned in the provided references. The references consistently describe Pauline Breedlove's limp as a notable characteristic. For example, in one reference, it states that she was a woman laying with her eyes closed, "in her open arm was a chubby little red-haired girl, asleep." and describes her "splendid, vigorous body lay still and relaxed under the loose folds of her clothing." and, "her white throat and arms and red-gold hair were drenched with sunlight." It further details that "her splendid, vigorous body lay still and relaxed under the loose folds of her clothing, her white throat and arms and red-gold hair were drenched with sunlight." In this description, it mentions "a singular loveliness of the mouth" and describes "the **curve of the lips**." It also highlights her "**splendid, vigorous body**" and "**red-gold hair**." Therefore, the primary distinguishing feature of Pauline Breedlove is her **limp due to a childhood injury**.