Her big eyes and plump lips are distinctive features that make her a great model. These are just some of the special features that distinguish her.
You might recognize the Latin prefix dis in the adjective distinctive. Dis often means "apart" or "away." Think of this when trying to remember the word distinctive. Someone with distinctive features has features that set them "apart" from others. Yes, its stepped-back architecture and distinctive spire are among the Empire State Building's distinctive features, but its most distinctive feature has to be its height: for decades there wasn't another building in New York that came close!