I think you should have placed Spike with Twilight, he would have felt less... misplaced... ^^

It bothers me a little that Applajack isn't looking at the center. Rainbow has her hair pointing the center, Fluttershy tilts her head to the center, everypony else look a the center, but Applejack just doesn't point the center at all.



Except for those little details, that's one of the greatest MLP wallpapers I've ever seen.