It's pretty accurate, but it looks too.. severe. Master Yoda is many things, but he isn't stern. He usually knows more about situations than he lets on, and has a sort of underlying amusement when he offers advice. He's very calm and wise in serious situations, though. He's a good Master. I don't think he ever does anything without a purpose.
If we're all lucky, maybe he'll come here one day. We can all learn a lot from him.