There's something about her face that doesn't fully convince me, the eyes, probably, but it could be just me.
Other than that, I have to agree that it's a fantastic illustration! Loving your style, I'm digging it!
The shading, the hearts and sparkles, her hair and horns, the nails... it's all real nice.
This one goes into my faves, and I'm looking forward to see more of your works!