Hi, this is Zailcha, my herald of Slaanesh on big chariot. To make this model pop a bit and differentiate it from a "normal" exalted chariot, I did a few conversions.
First, I added a mirror left over from the DoK cauldron of blood kit and topped it with an unused Slaanesh emblem from the daemonettes kit. And I added a few purple/pink acryclic gems here and there and the chariot. Gems and mirror seem like a good way to symbolise vanity.
And secondly, I switched the normal herald mini with a Sorceress of Lust (from Avatars of War) that I converted a bit to equip her with the long barbed whips.
More pictures there: https://legolemquireve.wordpress.com/2018/09/21/zailcha-emissaire-de-slaanesh/