In answer to your interesting inquiry, I would offer my own very limited perspective, which includes my own experiences and feelings, as well as having come in contact with a pretty good number of fellow model train hobbyists.
To me, a significant milestone in a hobbyist's experience is building a layout. That creative adventure of shopping, meeting new people, crafting, shaping, and configuring is very, very satisfying. However, once it has been accomplished, even more than once, one finds oneself looking around and saying, "What's next?" Let me suggest, though it will sound counterintuitive, that "finishing" a layout can be a big let-down.
That is the main reason why I often caution against hurrying along the way to accomplishing the layout's first iteration (Oh, yes, there will be more.)
I started my first layout in 1995, consuming the entire basement with it, which included the very necessary (for me, at least) prerequisite of having my wife's approval, encouragement and participation. Yes, participation. I barely made a single vignette on the layout without asking her to visit the layout and give her opinion. Almost 100 o/o of the time, she was right, and I followed her ideas or blended them with mine. Subsequently, there was never any of that "sneaking in the back door" with purchases. In fact, many of my most expensive scale locomotives were gifts from her (!!!!)
And all along, I wasn't "precious" about any scene I had created. Positively everything was up for renewal or replacement. Why not? I was at-play, after all, and that meant fun and experimentation. (You asked for pictures. Here is just one example of a site that evolved, over time...)
After Myron Biggar sent Fred Dole to the house to photograph the layout, presentations in OGR meant the phone started ringing, with fellow hobbyists calling me to ask if I would do such layout work for them. And when Lionel itself called for me to work on modifying a couple layouts for their corporate use, as well as for their layout at F.A.O. Schwarz, then, I knew I had shifted gears and was "on-a-roll." I soon discovered, after taking a booth @ TCA Meets at York, especially, that I had a little business that had grown out of my hobby, which was keeping me interested and involved, to this day, albeit less and less each year (I'm 73).
I report all this to you, for your consideration, to underscore my point that the creativity of making a layout, even a simple diorama featruing a train shuttling backing-and-forth in a closet, gives mega-satisfaction. Having the trains ,even in boxes stored away, lets us reach back in time to very happy and satisfying moments in our lives, times we have every intention of recreating as best we can, through our trains. A lot of us are successful at that reach-back. So, I would ask you, "Are you satisfied?" If not, you will know what to do next. Reach inside. The answer is right there.
FrankM, Layout Refinements, and Moon Township.