Follow these steps to create the images.
1 - Do you need create different proposals, example, one proposal with the original site, and another one with the project.
To create a proposal go to "Proposals" and click "Add New"
2 - Now choice a nice spot of your project and create a bookmark.
3 - Go to "Visualization" menu and go to the option "Create Snapshot"
4 - Create a snapshot with the resolution do you want.
5 - To better results turn on the option "High Visual Quality" in "Visual Effects"
6 - Change to proposal with the original site and follow the same steps (3-5) to create the before image.
7 - With the two images you can use the PowerPoint our some other sofware to create a cool effect with before and after images. Link this one
