Archana has natural beauty... the more simple the more gorgeous she would look.. besides they have been shown from a middle class family so the kind of look goes along with their background as shown in the show. As for Radhika she has has been show from Purohit parivar which is supposed to be a very well to do family... so in that case the heavy jewellery may make sense.. However yes Archana does not need all the heavy stuff... the more simple she is the more gorgeous she would look.... 😊