First of all... I know that AS has it's limitations... and certain styles can be difficult to pull off well... personally I like the idea of using less anatomically detailed characters because it can cause more trouble than it's worth... but I'm not really the most experienced user so I dunno.. maybe it can work really well.
But anyway.. it kinda looks like you're doing something half-way between detailed realism and 2D cut out animation, and I don't think it quite works.
Anatomy is not really my strong point so I feel a bit silly doing this but I tried doing a little paint over just doing things that I think would make it look a bit better. It's mostly little things but I pointed out the main things that were bugging me in red.
Overall the design looks a little lacking in flow... like the pieces aren't really joined together. It doesn't help that the line styles are inconsistent, I think you should just stick to solid black.
Also, it looks like you've been looking at how to draw anime books. Now, if you haven't, GOOD, never open any of those books except to laugh at how bad they are! If you HAVE... try to un-learn everything you've learnt from there... they will hinder you more than help you.
The best way to learn how to draw is life drawing and lots of it... don't be like me, get interested in it and do it lots. There's a book by... I think it's Andrew Loomis which is quite old but pretty good. Also Ben Caldwell (I think that's his name) does good cartoon-styled how to draw books.
Also... I tried just sorta redrawing it like really really quickly... cos after doing that paint over it kinda looks a bit... boring, lacking in style and general coolness... so I kinda took some of the ideas you had and tried to push it a bit further...
Dunno... doesn't really look very good tho : P but hopefully you get the idea.
It's not far from being a decent design... there's just lots of little things that are a bit "off"