Merry Christmas from Hatsune Miku

The shading on the face is good. You made the glow from her hair cast shadows on her face, and the lights in the background as well. And speaking of the background, it's very cute! The only thing I could say would be to make the background less black, maybe more of a dark blue (considering it looks like it's the sky) with all of those bright lights. The black sort of contradicts the cheery mood and makes her seem a little lonely. Of course that's just my opinion. Overall it's very good!