It's best if you study real human anatomy first.  If you don't have the basics down it's hard to get it right.  I know it a very common saying around here, that probably doesn't make much sense till you try it.  But it's very true.  Try studying from life as much as you can. Here 
this should help if you don't find a real model.  But even going to a coffee shop or even in class you can find all sorts of poses to practice with.
If you don't want to take my advice, just try to find the pose you're looking for (not anime) and use it as a reference.
Hope that helped!  Good luck! 
 biggrin