"Boyish look" refers to the appearance of someone, typically a girl or woman, that resembles the features or style associated with young boys, such as having a more youthful, less mature appearance. Full definition
Channel a relaxed, boyish look with our mid-stone short boyfriend dungarees. (topshop.com)
The red hair, freckles, and boyish look of Colored sculpture draw associations to such literary and pop cultural characters as Huckleberry Finn, Howdy Doody, and Alfred E. Neuman, the mascot of Mad magazine. (davidzwirner.com)