Its looking good so far. Depending on how much time you want on spend on it, and whether you are happy with what you have done, there is still quite a bit more that can be done. The main thing that needs to be done, is to remove the dark marks all over the picture. ie The clothing on the left hand girl should be white. At the moment she is still covered by a lot of dark smudging as is the rest of the image.
I think you have done a good job at removing the major damage to the image, now its just a matter of fixing the dark smudging.