All images copyright Mattel. Complete graphic the result of yours truly.
This is a color comparison between the sixteen characters currently listed on the Ever After High website as of October 12th, 2014 - comparing official/promotional art, animation appearance, and retail doll photos.
Color samples correspond left-to-right with images:
Left is official/promo sample
Center is animation sample
Right is doll photo sample
EDIT 1/31/2015: Updated Duchess Swan’s line to include doll color comparison.