It is 14:30 and the nights is coming. All day, the sun was stuck to the horizon,
diffusing a soft golden light that stretches the shadows.

Magali : How do you know how to place the buildings ?
Sophie : On the horizon line is placed "a vanishing point". Draw the line and place that point.
Then, draw the axes converging towards the vanishing point and build your city.
This is the base of perspective.