Absolutely lovely picture you have here! The textures are gorgeous, for one thing. The boots actually look like they're covered in glitter, thanks to the reflecting technique you used. The hair is another factor of texture that really makes the deviation stand out- the color is almost perfect and the frizziness makes it actually look like HAIR.
The shading is also incredible! The highlighting actually makes her look as if she's under a spotlight and glowing, if lightly, in the B behind her. Speaking of the B, the different sizes of the individual lights is a tad odd, but if that's the only, measly, nit-picky I can find.