the compound adjective 'sweet-faced' is a relatively modern english formation, combining two elements of germanic origin. the first element, 'sweet', derives from old english 'swēte', which evolved from proto-germanic 'swōtuz', carrying the core sense of pleasantness. the second element, 'faced', utilizes the past participle of the verb 'face', from old french 'facer', ultimately from latin 'faciēs' meaning form or appearance. the compounding logic is transparent and descriptive, directly attributing a pleasant appearance ('sweet') to a person's countenance ('faced'), a pattern common in english for creating vivid physical descriptors.

Structure: sweet (pleasant) + faced (having a face) sweet (old english, meaning pleasant or agreeable) + faced (old english, past participle of 'face', meaning having a specified kind of face)