Good eye is a phrase that is commonly used to compliment someone who has a keen sense of observation or who has a knack for recognizing something that others might miss. There are several synonyms for the phrase, each with its own subtle variations in meaning. For instance, someone who has a "sharp eye" is particularly astute when it comes to noticing details. Meanwhile, a person with a "keen eye" is likely to be perceptive and discerning. On the other hand, if you say that someone has a "quick eye," it implies that they have a talent for identifying things in an instant. All of these words can be used interchangeably to express the idea of recognizing and appreciating things that others might overlook.