This comes from a little story in the (awesome) pc game Planescape:Torment. In the game there are these portals that get activated by having a "key" at a specific place. The key can be anything from possessing a physical object, to thinking a specific thought, or humming a tune, etc. So there's this crazy lady running around in the streets, and when you finally stop her and calm her down, she explains that as a girl she was playing in a field where two trees crossed each other, and happened to accidentally activate a portal between them. Out of curiosity, she entered, and ended up in a city. She tried to find her way back, but the portals aren't always two-way, and ended up traveling through a bunch of portals that led to different places. The last portal that she went through, however, was so frightening and disturbing that she never wanted to enter a portal again. They mentioned something about her teeth constantly shifting around in her gums as well, I guess which happened at the last plane she entered. So for the past thirty years she hadn't even crossed under a single archway (I guess the last portal she came from was under an archway). So anyway, you help her out by talking to some experienced planes traveler and he finds the way back to the portal with the two crossing trees.
Sorry for my crappy storytelling ability, it was told with much more grace and impact in the actual game. But anyway, that was my inspiration for this.
I'm pretty happy with how the landscape came out, but I just couldn't seem to get Ingress' pose, skintones, or dress right.. even the hair I'm not too happy with. But, I got tired of messing around with it so I decided to just leave it like this :b