This is very good, if a bit different than the others of Miku I have seen. I like the fairly minimalist style and the subtle, but effective shadows. I love the eyes, they are very effective and I like the broad brush strokes a lot. I personally am a vocaloid fan and I think this is unique compared to other paintings, including your own. Personally I think it would look good on a background, like a stage, or a school, or something. Apart from that it is an excellent painting and may I suggest something with the reston vocaloid in it?
ND