I see the new 20$ silver coin has a new picture of the Queen on the front or back ;-) . double headed coin ( heads I win tails you loose :-) I think it looks a bit better then the old one. Might be a good time to change it.
Since the new portrait is on the commemorative side (reverse), I don't believe it needs to adhere to the traditional rules regarding the facing direction of the monarch's portrait. I'm guessing it also makes it clear which side is to be considered the obverse and which the reverse.
Collecting history, one commemorative coin (or medal) at a time!