Detail level: detailed. Build something you would be happy to show: a recognisable silhouette with depth (overhangs, pillars, recessed windows), three or four materials with textured palettes, a proper roof made with the roof tool and trimmed, framed doors and windows, exterior lighting, and for a building a simple furnished interior. Add a small touch of setting: a path, a fence, a few trees (tree tool) or flowers (scatter tool). Survey the terrain and flatten the ground if needed. Look once at the facade and the plan with inspect_area before finishing and fix what is wrong. Typically 3000 to 25000 blocks depending on the subject; a small subject stays small but well finished.
