not just a pretty face

noun2

1. •
   Something that is more useful, versatile, or intrinsically valuable than might be assumed.

   • “I was thinking of flowers being not just a pretty face. They produce oxygen and keep us alive,” said the designer backstage. — 2013
2. •
   (humorous) Someone who is more intelligent, talented, or emotionally complex than might be assumed.

   • But she was not just a pretty face. She was brilliant, accomplished, powerful, and tough-minded, a woman of burning passions. — 2002