There are a few ways you can add an images to a vision board.
1. From the Clipper, under the Vision Board section select an area and hit Save. You do not have to add to the Products board at the same time, but if you only save to the Vision Board the URL and other spec info will not be saved.
2. Manually from the "Vision" section.
3. From an item on the Products board, to learn more please see this article: Adding item images to a Vison Board.