However you construct the buildings on your layout — with paper card, from plastic kits or scratch build them from foam board etc — this tip applies and will make them look more natural residents of your miniature world.
The tip, to keep things brief, is to bed buildings into the environment around them.
Don’t just plonk them down.
In a rural environment, plant bushes and greenery along the seam, between the ground and walls of the buildings.
In town and cityscapes, apply a wash coat of dark paint along the join between the building and pavement or tarmac that they sit on.
For both, placing signs of habitation — tools, storage crates, barrels and pallets (as fitting the scene and era being modelled) — against the walls of the structure also helps.
By way of example, just look at the photo above, which I took recently, of the stunning 82G O gauge model railway.
Notice how the area where the shed meets the ground is darker, how a cycle (perfectly in the context of the scene) and weeds have been placed. Perfectly done, giving the impression that the shed has always been there.
Doing similar on your layout will blend the buildings into the landscape and will make the layout look far more convincing but is also relatively quick to do. It’s an ideal job to do when you don’t have much time but want to get a bit of modelling in.
What objects could you place at the foot of your buildings tonight?
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"Awesome stuff. I will be using your site a lot, for tips and ideas." @MuddingtonIII