My entry for day 28
of Equestria Daily's Artist Training Grounds II. The brief was "draw a pony moving on".
Today's theme was crying out for a Luna/Nightmare Moon piece. How does one move on from doing something regrettable? Here, a sister's forgiveness banishes the spectre of Nightmare Moon. I wouldn't be surprised if we saw a "forgiveness" episode in the show itself (not necessarily between Celestia and Luna; fascinating as that could be, they're not really the focus of the stories).