There are several ways to describe someone who has nice ears. A few synonyms for "nice ear" include "pleasant ear," "delightful ear," "charming ear," and "appealing ear." You could also describe someone's ears as being "attractive," "adorable," "cute," or "lovely." Alternatively, if you are trying to complement someone's ability to listen well, you might say they have "attentive ears." No matter which synonym you choose, it's essential to be sincere in your compliment and to make sure that your words aren't offensive or overly personal. Ultimately, any compliment should be respectful and delivered in a kind and considerate manner.