Yay the third installment is done! I'm going to do another, possibly a fifth if I can think of more characters. So far the fourth will include Twilight's parents, Chrysalis, the Spa ponies, and Nightmare Moon.
I was going to call Octavia my favorite from this line-up but then I saw Discord in all his mismatched glory. Honorable mention to the Flim Flam brothers and Vinyl Scratch for her Skull Candy headphones. I shall have to check out the rest of your gallery some time, this is very well done.