Looks kind of unnatural
I have to agree with EnactJudo, to an extent. The face is the thing that bothers me the most. Mainly, her muzzle. I can't explain it. It doesn't look like a muzzle to me, it's more like a...lump. It should be a tad longer and more squared. Kind of like this photo:
http://en.wikipedia.org/wiki/File:Sunny_Fox.jpg
Another thing that could be improved is her chest. I think her breasts too close to the neck, and too high over the armpit.
One last thing to critique, I think her arms are too short in comparison to her legs. In most of her official artwork, her arms are longer. This site has some pretty good references:
http://starfox.wikia.com/wiki/Krystal
To end on a positive note, I think it's a good start. I believe you have talent. Aside from the length, the arms look good to me and so do the legs.
I hope this helps.