Assemble the image from irregular angular glazed-tile shards with varied sizes, narrow nonrepeating grout and occasional chipped ceramic edges, with glaze and grout texture visible everywhere. A steam train emerging from the dark mouth of a stone tunnel into a snowy mountain valley, steam billowing from the chimney and rising along the cliff, a stone arch with a keystone around the tunnel mouth.
Light: the tunnel mouth deep indigo and black tiles with a warm gold glow from the locomotive's lamp at its centre, the exterior in bright overcast winter daylight, the snow in pearl, white and pale blue shards and the steam in white and pale grey shards, a thin band of sunlit gold tile on the far peaks; the track's curving line of tiles leads out of the tunnel toward the viewer. Glossy, cool, jewel-toned finish.
Tall 9:16 portrait frame, composed vertically with the main line of the scene rising through the height of the frame. No people, readable text, signs, numbers, logos or brand marks anywhere; the train carries no lettering or numbers.
