http://www.youtube.com/user/puccagarukiss
A very sweet young lady who is to Sunset Shimmer, as IMShadow is to Twilight Sparkle.
Her other voice work is also just as stunning, so sub to her, if you can, hehe.

Also, the Crystal Sunset Shimmer pic was done by Tzolkine on deviantART: http://theinvertedshadow.deviantart.com/art/Sunset-Crystal-Wallpaper-388496007