The way you drew her face is lovely, possibly my favorite part of the painting, along with the beautiful hair.
However though, I have to critic the way you drew her lower part of her body. For starters, you drew her buttcrack WAY too high up, it looks really silly. Also, the left part of her bum seems significally smaller then her right one. Lastly, (and this isn't much of a problem, really) but her claws aren't that long. They're as long as her hand is.
Despite that, I have to say that the buttcrack is still worst part of the painting.
...I'm sure it would look alot better if you edit it a bit to tone it down. But hey, in the end, it's your choice. I'm just giving you my honest opinion.