What happened to my image?

[Dr.Dank]

When I originally cut out my daughter (girl in the rainbow dress) I used the fuzzy select tool. It did a pretty good job of finding her edges, but it also selected a few stray pixels and small patches on her dress. I deselected as many of those as I could, but didn't get all of them. Could that have had something to do with it? This time I used the scissors select which worked much better.