Akai Kuchibiru

It's not bad, the face is done very well, along with the hair.  However, that solid black is working for this image. It just lessens the impression of a 2-d feel. It's all black, solid, in other words very flat to me.
Even if you made the shirt a dark dark dark blue it would change the picture, or at this point the picture might have worked better in only black and white.

The last thing is the nose perspective isn't working quite well, but then again this is just what I see. I'm sure others well tell you it's perfect!

I'm sure you worked hard on this and keep up the good work!