Over-all, a job very well done. It matches the style of the pony world, as well the colors are very deep. The lines are correct, the over-all figure very well crafted. The eyes are quite lovely, as well, I might as well add. Though, the impact of the work is limited due to the simplicity of the color scheme - as deep and fluid as they are, the more color is added to a My Little Pony piece, the more it sticks out - such as Rainbow Dash, in this instance.
As well, I put the vision on it as a three-point-five due to some spots seem to be blurred in this part. It may have been an error, or some sort, as well the over-all layout, I believe, could sue some improvement. On the case, originality is quite well-done, if I may say so - the color scheme, as well as the over-all look of the piece is very unique in the world. The way the smile and eyes match makes it a very good piece, though could use some improvement. As for technique, I am no illustrator, so it would be wrong of me to say that I could do better - and I doubt a lot of people could. Though, I put the technique at a four due to some minor problems with the over-all picture of the pony: the tail seems more akin to a fox, and the nose appears somewhat too... swollen, you can say. Again, it is a very well-done piece, and the detail is good.
Though, speaking of detail, it could be possible to add more onto the body, hair, and tail of the pony in this case - the more the better, in my opinion.