Wow, I can see why this is one of your favorites - I love it~!
As always, the crystalized effect is implemented beyond beautifully *nod nod* The color variations are just wonderful. The mane and tail especially make me think of a galaxy, which is perfect since Miss Luna is the Princess of the Moon~! And I like your choice of using the crystal jewelry and such. It really has a certain shimmer to it that makes her whole figure just glow, as any crystal pony should. I can honestly say this looks like something the artists on MLP could create, or even better. Keep up the good work~!