How to make plastic figurines look UNplastic?

[frogmarch]

I’m making a diorama around a miniature castle I made out of real stones. The diorama features knights and a dragon. The figurines are very detailed and of high quality, but they’re plastic. Is there a way I can make them look less like plastic and more like ceramic or plaster of Paris? (I'd hate to ruin them.)



Here they are again, but I like this story better:



Thanks for any suggestions.