That's a very cute outfit. Nice job on the highlights and shading. I also think it's interesting that you decided to outline your picture in more than just black. The only criticism I have is that her head looks like it's turned a little too much, thus making her head look like it's on backwards. But that's the only "off" thing I see.

I'm sorry to say that I have not heard of this manga, before. Then again, I draw more manga-like pictures than read actual manga. But, if you want to suggest it as a category, I just found out who to ask about it: SabrinaM. Be sure to give a link to your drawing as proof that there is, in fact, Greenwood fan art on the site. Hope that helps you!