Cool work!
Consider deleting the grey areas and using the color of the shirt for the shadows in the landscape and the girl. Also, the end of the girl's hair seems to cut off a little abruptly as if it ran off a page or something.
the girl doesn't seem to be a part of the background design, fix the cropping, and possibly make the girl's skin grey and her shadows pink, although, i'm not sure that would mesh well either. just try different color combos, etc.
I appreciate all the comments. What I was going for (for all it's worth) was the look of an oversaturated xerox if it was recreated out of cut out paper. There is a certain intentional awkwardness, such as the blocky cropping of the bottom of her hair and the ambiguity of the middleground buildings, which would have been easily more clearly defined, but I personally liked the slight choppiness. Again, I appreciate the comments just the same.