Everything looks lovely, except for the legs, cutie mark and horn. The legs just don't look right. You should work on those, as well. The crescent on her cutie mark should be moved a little to the left. Finally, I couldn't help but notice the spiral lines missing from her horn, and no unicorn or alicorn drawing is complete without them.
In all honesty, that wasn't what I was going for when I drew her (I just wanted to try a different look for her hair haha) but some people seem to be getting that impression. Now that they've mentioned it, I can see how they get the idea
...Not quite sure how I got here from comics... meh.... this image is really pretty, I love the way you did the eyes and hair...wings...colors... ... ...you did a really good job on this and the elements go together nicely