The first thing I notice with this piece is the crisp definition with the hair. The layers and the flow of direction is what gives the appearance of 3rd deminsion, even though it's a 2d piece. The over all expression of this is beautifully crafted and very well executed and is highly successful with the angle of the face. This piece is sharp, is very detailed, has great contrast, and is very clean. The only thing I see that may need some attention is the top lip. It needs to stick out a little past the face, but not too much. Great great great! Keep this up!
I am in agreement with the first critique, in that the first thing that stands out to me is the hair. The combination of the shadowing, the lighting/shine and the way it sits on her head makes the hair the most realistic aspect of the drawing. I have not played FFXIII--so I'm not familiar with this particular character--but I do recognize that the style of your drawing perfectly matches that of square-enix's characters in its FF games past VIII.
Criticisms would be nitpicky, since overall this is a well-drawn and nicely shaded piece, but would include:
1) Her face seems too perfect to me. It's mostly a personal preference but the "pretty girl" art I find most appealing usually includes some type of minor facial imperfection or blemish that makes the face more unique and relatable. Maybe a *minor* wrinkle around the eyes or nose;
2) The ear may have a little more definition. I hate drawing ears, so I usually pay very little attention to them but I think they're always really noticeable from side views; and
3) Maybe a bit more definition on the collarbone? Unless you were trying to downplay her femininity. But I think it would looks good since there is an emphasis on the necklace.
Otherwise, that's it! I still keep looking at the pencilwork on the hair. Great job.