not just a pretty face
Noun
Meaning
(sometimes humorous) Someone who is more intelligent, talented, or emotionally complex than might be assumed.
(idiomatic) Something that is more useful, versatile, or intrinsically valuable than might be assumed.
Source: en.wiktionary.orgExamples
Further singles were " She's Not Just a Pretty Face ", which was a country Top 10 hit, while the last US single, " It Only Hurts When I'm Breathing ", made the Top 20 on both Country and AC.
Not Just a Pretty Face: Dolls and Human Figurines in Alaska Native Cultures.