The changeling version of Diamond Tiara. I thought that she and her cheese legs deserve a full-body shot.
Even though she's a blank flank, I think that it's not too bad. I still prefer a blank flank Tiara over the Cutie Mark Crusaders (who are awesome in their own way).
I think that the lack of a streak in the reference shot isn't an animation error, but art evolution. In Ponyville Confidential, the streak in her hair often disappears when she turns her head, but I don't recall that happening in her earlier episodes. Nevertheless, I added in the streak since I wasn't going for show accuracy (with her being a changeling and all).