I'd like the second one better with thigh-high stockings, but yeah, it's the best
The one that most people have voted for (the spookyz.com one) is fine, but it has too much of an "I'm an adult awkwardly playing dress-up at a sexy Halloween party" look to it. Most of the others are much more "in the role" because they're wearing actual school girl uniforms. It's odd to be picky about this kinda thing, but there you go XD