Even if you cannot visualize a finished product before it is done, that skill will typically come with experience. Avoid saying you have no vision since it shows that you do not think outside the box and lack creativity. If you are new to the industry, you should explain that you do not have much experience seeing the finished product for drywall, but that will come with experience. You can describe another situation where you could visualize the finished product before you completed it, such as putting together a puzzle, a piece of furniture, or a model airplane.

"I am new to the drywall industry, and I need to gain more experience before I can visualize the finished product when it comes to finished drywall. However, I love to sketch and draw buildings, and I am always able to see in my mind what the finished sketch will look like before I complete it."