On Luna Eclipsed.
I really like the subtle imagery that I don't know if Omega caught or not, so I'll just spell it out here.
Probably one of my favorite still shots. She is literally eclipsed by her former self and can't get out of the past. Plus she's pushing a little piece of candy towards the statue it's just a really nice scene. I didn't catch it until I saw that picture.
Edit: Plus Twilight dressing up as an old obscure historical figure is so wonderfully Twilight, it's great.
If Ponies was Hamlet, this would be the kind of thing that teachers would be spazing out over.
Quite a lot can be read in that picture...
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There is no shame in not knowing; the shame lies in not finding out