Yes, scenery "details"

[nachoman]

You don't even need to get out of the city. Simply taking a walk through your neighborhood you can notice details that you need to add to your layout. Examples are the types and frequencies of cars that you see, or pavement color variations. Or perhaps by watching pedestrians you realize your layout has the wrong ratio of women/men/children. You can even notice behavior patterns that you can try to replicate - like how people that know each other will walk abreast rather than in file or how everyone doesn't drive in the exact center of their lane.