I was about to say the same thing? Why is everything but the character is blurred? You know what could have resolved this, If there was a camera blur on her that was very very thin. Twist her so her right arm is more away from the camera and her bent knee towards the camera.
This way the arm with the sword gets blurred and the knee gets a little blurred, but her body and face wont be blurred. Also the shadow would be blurred to match the background image.
That might make it work better.