Personally I think you should always copy, whether it's anonymous, traditional or famous designer. Some of the worst designs, amateur or professional, are due to desperate attempts to be original.
So if St Krenov is your thing don't attempt something "in the style of JK" - it'll be rubbish. Instead go for a direct copy - he did it better than you could.
Ditto "trad anonymous" and "in a traditional style"
It's how most art and craft skills were are taught until subversive ideas about creativity and originality took over, to nobodies advantage.
Also if you copy good stuff you will probably learn something about what makes it good. Eventually you may even come up with good ideas of your own, but it's not essential by any means, why bother?