Changng image on double page spread

I have decided to change my double page spread image from my model Erin to my other model Megan. I have done this because now the models on the front cover and double page spread match, which is important because on the front cover, it has been portrayed that Luna Cooper (interviewed artist for article on double page spread) is the model on the front cover, where as once you go to the double page spread, the model is different.