I took an image of a tree from Google and brought it into AI and photoshop and put some effects on it. After messing around with a few I narrowed it down to the bottom 4. I am leaning towards the softer images like 2 & 3. I think it goes with the story more as it is about an 11 year old girl. The background could perhaps change to the more sharp images like number 1 as the end of the scene she is upset?