I'll start with points that I think are effective and you should repeat. (if possible) The coposition of the face is very well done, and the features are very nicely positioned in reation to one another, the fur detailing and general design of the little moth-thing are also quite nice. Tha colours of the image go very well together aswell, they compliment very nicely I feel.
As for things that might be good to work on... Dramatic lighting, or probably a bit more of it, might be a good thing to try and work on. It seems that the moth in the only scource of light, because of this shadows probably wouldn't be very soft. (take under the chin, that shadow could be a bit darker than it is)
Also, there's *one* thing, the sleeve of the right arm seems a bit far down? It makes it seem like the arm starts out quite thick and goes dramatically thinner. (or it does to me, I dunno) Perhaps if the bottom of the sleeve were a bit higer up or if there was a crease to indicate the arm wasn't taking up that space?