The very last step was to add some sparkling particles or whatever you want to call them.
The little images show you what I added with the opaque white. I used the small round brush (size 00) to add details to the orange fan and little dots on the the flower in the hair or the eyes. I also enhanced the wind with it.
Finally I added sprinkles to the rest of the dark background for which I used the round bristol brush and the screen. It's important to cover the drawing where you don't want any colour splatters. Since I still had one untouched copy of the original outlines, I cut them out and put them on top. It's that easy.
One thing you should keep in mind is that the opaque white for the use with the screen can't be too thick (no sprinkles then) or too thin/too much water (you'll end up with a big white blob on your drawing -_-). Always test the colour consistency first!