This artwork is simply beautiful. The presented atmosphere captures a soothing mood, which also goes very nicely along with Fluttershy herself. Speaking of Fluttershy, her outfit emits a cute charm to her, but in a different, more stylized fashion. It's even pleasant to just look at the grass(?) and the butterflies, it's so nice that even the smaller details can look as angelic.
The ONLY little tad bit that I'd like to make a note of, that keeps this from getting a completely 5/5, is...well, the fact that we already do have plenty of Fluttershy images lying around on deviantART. But what matters, is that this is one of the most spectacular masterpieces of Fluttershy ever to be created.