Jess drew the way some people drank whiskey.
It's a nice line. I'm actually a little jealous of it to be honest. However, this is a book aimed at kids, so I question the appropriateness of it. Don't get me wrong, my questioning doesn't stem from the line refering to alcohol. Kids know what whiskey is, talking about it is no big deal. What I wonder, though, is how many kids can really decode this particular metaphor; hopefully there aren't too many of them that are whiskey drinkers.
Honestly, not being a whiskey drinker myself, I'm not sure I understand what it means. How can the way someone draws be like drinking whiskey? Any whiskey drinkers out there want to help me out?