These nymphs are ceramic. I don't know the exact construction method but I think is similar to what I describe below.
They are lead wire wrapped over the hook, covered with layer of ceramic paint that is fired in a kiln between each step, then covered with a clear glaze that is fired.
The French Chronicles: Ceramic Nymphs
How to Paint Ceramic (with Step-by-Step Illustrations)
Regards,
Silver
"Discovery consists of seeing what everybody has seen and thinking what nobody has thought"..........Szent-Gyorgy