In both photos — the same girl, on Reddit her nickname is Moniquey. She dyed her hair in two colors at the same time and now can wear every day blue, or pink hair — depending on her mood or image. The secret is lay hair differently.
So Australian looks when the strands of her hair hidden under a blue and pink.
The trick can be revealed when looked at the girl’s back: it is clear that the hair evenly painted in two colors, and they are mixed in purple in the middle.
In the summer of 2016 another girl, SIFCO, posted on Reddit, where she turns her hair from brown to blonde in a few seconds.