Thanks all! Sorry for the lateness of the reply; I was on assignment in the Outer Rim territories...
The shimmering dress on the blond witch was built up using a fine sparkle medium mixed with white to achieve the right balance of colour with the sparkle effect. I got the idea from Dr. Chimpula's Round 10 entry in last season's LPL (The Last Unicorn) and had experimented with it on several Lurker models in the Strange Aeons board. Overall, I like the effect, as long as it is used sparingly.
The hair is my usual blond hair recipe (Vallejo Desert Yellow, built up with successive highlights with increasing amounts of white) but with some silver added to give it a shimmer that was distinct from the dress in both colour and effect. I wanted her to look almost ethereal as if her beauty is a kind of magical spell. I'm rather pleased myself with how it turned out.
The cauldron actually uses glow-in-the-dark paint as well - I was trying lots of new techniques. It required several layers over a white base but has a great sickly green shade.