Your shadow map is covering a too large area, that makes the shadows very blurred. Switch the view to the "shadow lite cams" and then adjust the dials so that the central objects of your scene (Koshini, dog, ball, chairs, table) fill the view. Do this for each of the shadow lite cams. If you render again, you should get much better shadows. If that still doesn't help, you can try increasing the size of the shadow maps, but be aware that changing from a 256 to a 512 shadow map increases both render time and RAM usage to 400%.