The term "keen eye" describes someone who is observant and discerning. There are several synonyms that capture this same idea, such as astute, perceptive, acute, shrewd, and sharp-eyed. Other options include quick-witted, discerning, insightful, and attentive. These words all convey a sense of intelligence and awareness, suggesting that the person in question is adept at noticing small details and making insightful observations. Whether you are describing someone's natural talents or looking for ways to articulate your own strengths, these synonyms for "keen eye" provide a range of options to choose from.