I drew this back on labor day.
On that day I was originally trying to draw a side view of a pony lying down on it's side. The idea was in my head but I failed to get it down on paper properly. (It's a bit too difficult for me to process the perspective).
After trying attempt after attempt without getting anywhere for 45 minutes I instead drew how I was feeling at the time.
It started out as a base blank pony but I turned it into pinkie since her Lament came into my head at the time. Also she just best represented how I was feeling.