While it is true that Trudeau is embarrassingly superficial, it would be a mistake for the Conservatives to focus on it.  It plays to his strengths.  

The best way to get to him is to highlite his long laundry list of broken election promises.  He promised so much and has delivered so little...even backtracking on the major issues.  

Don't want/need personal attacks.  Just show the facts--what he promised, and what he delivered, and ask if people want more of this bait-and-switch disappointment.