Changing an image doesn't have to make it better, it can just make it different, so I can't say that the "After" image is better than the before, all that I can say is that it is not the same.
Maybe often the original and natural is best, as otherwise the image is just not "real" anymore.
It just depends on what a particular person might want.
If the image is kind of bad to start with then changing it some might make it somewhat better, but if it is O.K. then it might be best to leave it as it is or at least not to change it too much.
Take a look:
There were changes made, but the changes were not too extreme as they could had been.