What bothers me on it is her stomach, it seems a bit large. It should be small from the neck, and the curves should slowly slant outwards into the skirt-ish thing. The skirt-ish thing, should be a bit longer. And I'm guessing the red things on her head, should be sticking outwards.
The arsm should be a bit skinnier, and the elbow to fingertips, should be larger.
Shading has never really been a strength of mine, usually I don't even colour. I could never really figure out where the light should be coming from...
As for the body, well, yeah, it's my first time drawing any kind of Kirlia, so I could definately use more practice... but I really need to be working on my fanfic rather then fanart.