Sorry about the late response! Leaving Granny Smith out was because I simply couldn't fit anymore ponies into to composition. In retrospect, I wish I had included her! She is such a darling! And as for the Finnish dub, I really don't know since I've never watched it myself. :0
Believe it or not, she had become the core for Canadian female voice acting. She even does vocal effects for certain Animals, as well as regular voice overs, much like Frank Welker and Dee Bradley Baker.
Nicely done! Packing this many ponies into that much space is a feat in itself. I'd like to note that the shading isn't quite consistent. The extra little shadows like on Ms Cake's right leg, and the one behind Rarity's foreleg. You haven't added such shadows to other places like underneath Luna's foreleg, and Nightmare Moon's armour would create little shadows like you've got underneath Luna's hair. Consistency is key. However, this piece is good regardless.