It's close, but the spikes kill the effect slightly. Twilight was done perfectly, but the spikes look like the color was shifted and/or they were pushed over with a trail behind them. The two spikes behind her tail are not in 3-D because they look like they are supposed to be beside her, but her tail is covering them, creating a paradox.
If you look at this cross-eyed, (I will delete from Imgur if you wish) it may make it easier to see that the trail behind the spikes on the right and the two spikes behind the tail kill the effect a little. Just some observations from someone who has done a lot of experimentation with cross-eyed stereoscopy and has made the same mistakes before haha. Also, there is a slight trail behind her horn as well. Excellent try though, and its a good stock image to make into a 3-D, just some tweaks need to be made to the spikes. I want to see the next rendition!
No problem! My first time trying to make a stereoscopic image I actually tried just skewing one image and leaving the other one the same. Was highly disappointed when it just looked like a blur. You'll get it figured out, it looks like you already know how the effect works so now it is just some fine tuning.