Correct, turn the shadows off for the light that casts this shadow. You will find a check box in the light properties dialogue. The real problem, though, is why the shadow appears like this? Is the girl really standing on the floor or is she hovering over it? A correct shadow on the wall would give a nice depth to the scene, but the shadow should originate from her feet. If you get it to do that, you can adjust the shadow strength for the light in question to make it less dramatic, I think that would improve the picture. Overall, it's a great pic :-)