Girls:
2 - a cute girl.
6 - works as an illustration for the original source.
10 - there's something about her.
I won't vote for Rarity a second time; she's the most beautiful pony, of course, but everything in moderation.
The first one is cute, but something doesn't quite click; the fifth one is just adorable, but the photo quality isn't great; the ninth one is a bit too colorful, although cute; the eleventh one is very cute, but not anthropomorphic enough; the rest didn't really appeal to me; they're cute, but not my type.
Guys:
5 - no comment, although, in my opinion, this mysterious well-wisher should have sent a picture of Troton (the best Doctor, no contest!) or, at worst, Tennant (the contest is for the most attractive, not the best Doctor).
7 - he looks too much like a girl, but there's not much else to choose from.
8 - I'll compensate a bit, especially since his appearance is unexpectedly normal, although he's not really my type.
The sixth one is cute, but his expression is silly; the fourteenth one is 10/10, I laughed a lot; the rest didn't appeal to me, either they're not my type at all, or they don't look very good, or both.
🏹🎪+⛓️♿=💕