Zex, its not so good for your exotics (although snow isolated perfect against the freez) but your garden is looking beautifull, like a little fairytale!
Hope your exotics survive and will be happy in spring.
Here in the Netherlands we have pretty much snow to (20cm) which is pretty unusuall, especially in my town which is close to the sea.
I didnt see so much snow in my neighbourhood for like 10years.
Greets and good luck.