I would make the wing slightly larger and the eyes a tad darker I do not even know what the marking is. It is cute but I would like to know what it is. I would add some shadow and the stance is a little strange but I like it I do want to see more out of you and I would also make the outline lighter. But overall it is cute and whimsical it looks like a my little pony to me but over all it is nice cute and pretty the color of the mane and tail match my hair so I like the color!
I have to disagree with bgb02 the wing and eyes are fine. Maybe the mouth could be a bit more visible! The mane is nice and not to shiny. The eyes are very well shaded, and you can see the emotion in them! The outline is a very good color and not to thin or bold and it is even all over. The cutie mark is interesting and I can't really tell what it is but It must match the pony's character. The shading on the pony is very good on the legs and my the mouth. And on the mane is is also good. I think bgb02 said the wings were too small because of the pony's body position and that one of the pony's legs is raised up.
Overall it is adorable and very MLP based. I love it! <3