Still called 'Crystal Pony'? By now i heard different names for her. 'Amber Leaf' is my personal favourite from those. Fits to her cutie mark and doesn't bring the sadness from King Sombras magic into her name.
The jaw looks kind of strange. The sparkles would probably look better when blurred. Now I'm too lazy to check, but don't crystal ponies also have eyelashes? Overall, nice job. Accepted to DeviantBroniesElite
It's not Canon yet but all over twitter and some fanfics I have seen her being called Crystal Leaf...just putting it out there. The librarian was also dubbed Britannica, at the Everfree radio chatroom about 20 mins after the lifting of Celestia's royal no spoiler decree.