Finally finished her! Been working on and off on her for months.
She's pretty small, maybe no more than half an inch taller than an current brushable. Completely sculpted from scratch, using Super Sculpy, and then painted with various acrylics and the occasional touch of Pearl-Ex powder to give her her namesake sparkle.
The sculpting part was fun, but the paint. . . ugh. If I do any other ponies like this, I'm so sculpting them from colored clay to begin with and only painting the details!