I think dark purple arm mounts could be a little darker (or a little less blue, little more purple), and perhaps the pink section in the center rear could be the same dark purple instead. Afterall, the pink in Twilight's mane is fairly small proportionally. And if you REALLY want to be touchy, her mane has a third color, a more "ordinary" purple between the dark purple and pink, so perhaps another highlight on the arms just above the pink highlight?
Other than that, looking good imo!
Edited by Damon Howe, 28 September 2012 - 05:10 PM.