i've never bought any 'manga' but i've read some online. I can't stad it. I have a hard enough time understanding American Comics, much less those ultra cluttered Manga-zines (that can't be an original joke).
Her head looks pretty much like I think it's supposed to, but hrer body is a little off-center, and her arms are rather skewed. The left one seems to be 'behind itself' (fix that easily by simply erasing the line that protrudes into the inside of the arm and reversing it), and the right arm just needs a little tweaking in the forearms.

I saw a picture of it in a magazine! Your pic is very good! Great job! Maybe try coloring it.