I saw it on ponibooru a long time ago, and like and idiot I close the window without reading the tags or the artist to find it again... I've been looking for it like crazy until some time ago.
Oddly enough, I thought she was some kind of re-animated corpse like a zombie (Probably because I was listening to this music while looking at it [link] ), but now compared to your other drawings, it's actually tame.
you wanna know the real reason I thought she was looking to someone behind her? I'll tell you anyways. Her tail is lifted and off to her side, but my assumptions are also because of the blush on her face and the silly grin.