I am not familiar with this character, but it looks like it is an interesting one! I really love this drawing and it looks like you put a lot of effort into it. I only have a few (hopefully!) constructive criticisms of this, and even then, they might not be criticism but just me not understanding the character.
The neck looks unnaturally long and thick, rather squarish. I do not know if this character is a man or a woman, or whether it's meant to be an androgynous type, but I think I see the rounding of the chest to signify a woman? The hands are large and masculine, and the jawline is fairly masculine as well. Again, if this is as intended, then I have very little negative to say about this piece.
I love the colors, and the shininess of the hair. Even though I said that the hands are masculine, they are beautifully drawn in an intricate pose, and I really love them other than what I mentioned earlier. The details on the shirt are very well drawn. Most of all, I really love the simple shading you did. You do so much detail with so few colors. Simply amazing!