I'll say this first; it is a great artwork. Shading, (especially with the slow transition from light to darkness on her body), is fantastic, just absolutely fantastic. The colors are beautiful, and are vibrant, but not overpowering, like in some artworks on Newgrounds. The major thing I don't like about it, is the appearance that parts of her body look 3D while other parts appear 1D. The head for example, looks kind of flat. The launcher on her arm as well. Her hood is another example, in my opinion. One last example is the piece on her right leg, whatever that is.
Truly though, it's a great artwork. There's room for improvement, in my opinion, but I guess there's always room for improvement. As a musician, I understand that. But, as I said, great job. I'd love to see how you improve over time, and, if I don't let it slip my mind, I'm sure I will.