There does seem to be something off about her anatomy.  I think it's a combination of her shoulders and that the colors you used, though vibrant, make her seem somewhat flat.  I see what her pose is supposed to convey, but it takes a little forgiving.  It's an action pose but, at just a glance, she looks fairly static.  Hopefully this isn't offensive.  It's meant to just helpful suggestions.    The character design is great!  Keep it up and like we're all trying to do... keep getting better!

I super appreciate the comment though!!! I'll keep it in mind

I definitely feel that I have not broken her back. I attempted this pose and use my own photos of myself as a direct reference. You can definitely turn like that! 

I respect the attempt, but you've completely broken her back. Did you use any construction? If not you might find it useful. Think about how her spine looks underneath. Anyway, keep at it, nothing helps you improve like challenging yourself.