That's probably true of all writers.
However, some writers carry those images, write a few words, and they feel they've created a picture with which readers resonate.
"My crystal ball refuses to function," I told one writer. "I can't see inside your head, no matter how wonderful your prose." It took her several weeks of struggle before she was able to move the images to her computer screen.
My assumption is that introverted and introspective authors have the biggest struggles in this area. Because they have what I call a rich interior life, they have to learn how to translate those mental pictures to the page. It may be difficult, but they can learn.
Inside my head, my words are always wonderful;
I seek to match that with the words on the screen.