I've decided to give a shot at doing a bit more than just doing a trace. Fluttershy herself is a trace from "Hearth's Warming Eve", but the rest is what I came up with.
The moon is based off of the moon as seen in "Elements of Harmony" part 1, although it has been changed a bit. I tried to do my best to make it look as if Fluttershy was wearing a space suit in a pony-crafted space ship about to land on the moon. I guess if what I added in just gives enough of an impression so that Fluttershy's expression can stand out as I interpreted it, then I guess I did my job.