Steam Train in the Highlands

A black steam locomotive pulls its carriages across a stone viaduct in the Scottish Highlands. White smoke trails over the arches while green slopes rise behind the train. Below, a winding river cuts through the valley, with rocks, heather and patches of sunlight breaking up the foreground.

Build the locomotive and carriage line first, then follow the repeating arches across the middle of the picture. The smoke is soft, but its edge against the hillside gives it enough shape. Grass and trees will take more sorting near the end. The river curve and rocky foreground help separate those greens from the higher slopes.