Earlier quoted context omitted.
You are hopefully aware though that this is not the norm. Many (if not all) artists tend to visualise their work before and while they are doing it.
Watch people draw, and you'll realize that can't be true, or at least is a very incomplete description of what's going on. People have processes they go through to eventually get to something reasonably correct. Systems for drawing people, perspective rules, etc. These get extremely elaborate. They shouldn't need any of it if they could fully visualize the scene. They'd just need to copy that image to paper. You'll h…
In general I agree, but I have a counter example. I have a friend that has always been very good at drawing, and when he draws, it's immediately obvious that he has a very precise idea of what is going to happen. People often gather around him because it is entertaining to look at the drawing and suddenly understand what it represents. It's a similar experience to uncovering a photo frame covered with dust.
I assume that this ability is not uncommon among professional drawers.