Single vs Multiple image inputs
You can upload up to 6 points of view of the same object so that you get a more accurate 3D model.
If your object is of simple nature our algorithm won't have a problem re-creating it with a single input image. It will take an educated guess of what is not pictured. For a basic piece of geometry (i.e. a table) multiple views are not going to make much of a difference.
For something more complex on the other hand, like a character, multiple views will make a difference so please upload multiple views if you have them.