I painted my 3D-printed domed public building yesterday
It's mostly a brown undercoat with successive dry-brushes of lighter, sandy browns.
Here it is under attack from the mighty Baragon (who is, in reality, about 3" tall)
To be honest, post-painting I can see a few print-errors which need to be corrected still, but this is a model for gaming, not for show. Maybe I'll sort them out one day.