In Adobe it should be easily accomplished in many different ways.
Alt. Click and drag would for sure be the easiest. It looks like there is a layer under the girls picture too. Add an image like the glittery background image as the background layer and arrange copies of the girl above it. If you need to, you can erase the background from the girls image leaving only her profile and transparent background. You could then play with opacity of the girls and layer blending to multiply or overlay. Really depends on the art you intend to use. Backgrounds and contrasts might keep you from simply copying and arranging layers with transparencies.