Heya 
With a normal Forge export, the image paths in the world will still be pointing towards your Assets Library and the images will not be included in the export. They also won’t have access to any of your premium Foundry modules (the ones linked to your Foundry license).
They will be able to use the world, and the images will work as long as you keep them in the same place in your Assets Library. If you want to export the images from your Assets Library for them as well, have a look at this article which explains how to do so 
Backing Up Your Forge Content