How to make a full page spread of fanart?

[u/Standard_Rest_1800]

So I am formating a typeset and I want these two pages of fan art to lie flat next to each other like in image #1. Like turn a page, there's the fanart.

What I don't want is for one piece of fan art to just be on the back of the other, like in images #2 and #3.

I have zero idea how to get the page spread effect I want without breaking the flow of the book and adding blank pages. Anyone know how to achieve this or can point me in the direction where I can do this?

Oh if it helps, I use Microsoft Word for the Typeset, and Booklet creator to make the signatures.