Scene from "Survivor Shy", a story that follows Fluttershy living in a world completely and suddenly devoid of other ponies.
With nopony to turn to, Fluttershy is forced to learn to fend for herself, and find a way, if possible, to bring back ponykind and save Equestria.
Half way through sketching this, I realised that this is somewhat of an inversion of Fluttershy's discovery of nature when she was filly. Instead of falling down and being saved by a butterfly migration, she is staring up and seeing a dragon migration for the first time.