I can understand the mental image bit and indeed since posting looked it up, but I think you possibly overestimate how much mental visualisation the rest of us can do.
In the film days, we used 5x4 Polaroid backs to generate instant prints to help refine exposure, lighting, and composition.
I actively need to explore different viewpoints and compositions. I don't actually take pictures, but I will move my mobile phone or camera into different positions, and then while looking at the screen, study it the same way as I would study it if I had a print. The only 'mind's eye' part of this process is visualising the picture on the phone/camera screen, as a print on my wall.
There is a reason why photographers refer to "working the scene" because you need to physically try out different angles and viewpoints to find out which one's work the best. In the old days you would actually take pictures, so that the client could make the final decision on which view/composition worked best.
Today, we have a choice: we can see what is happening with playback and decide which views/compositions we like best, or we can actually take the pictures and look at them back home.
I'm not advocating a spray and pray approach, as I still think every picture you take should be made with intent and thoughtfulness, but from a learning point of view, actually exposing your most likely keepers to review on the computer (or even better, as prints) is useful.
You may already know all this/thought about it, but I'm just trying to come up with some ideas.