I think Polly, like Jake, is very creative. I think this helps to open up the world for her, and it's a reason why she is so accepting.
This photomontage is effective because the pronounced highlights and shadows gives the image a lot of contrast and more visually interesting. The overly pink flesh color against the smoggy background gives the image a dreamlike look. The colors all blend nicely together as well and makes a surreal image appear realistic.