Drawing the wrong Harley Quinn

So my son finally started playing Arkham Asylum on his X-Box .... I've enjoyed watching. Phrases like: "Hit 'em again, Joe!" and "Use the Batarang, damnit!" fill the living room. Anyways, I was impressed by the new character design on Harley Quinn; a little grimier, a little sluttier- all things a mother hopes for her daughter. It inspired me to draw her, mind you, while I'm watching, the reference is in front of me, and I get it completely wrong! Things like that really rattles my confidence in my memory. I obviously don't remember what a Tommy-Gun looks like, either!