Back when I was learning French proper, my pronunciation was the best in the class, simply because my dad majored in French and listens to international news in French.
After I was exposed to rather too much British telly (I blame Sherlock), I found myself subconsciously pronouncing some words the British way even though I'm taught American English in school.
My french teacher told us to make the "r"s sound like there was a hairball stuck in the back of your throat. And also making everything sound slightly haughtier than usual.