Perspective Art for Kids - City Street from Above

My son created a bird eye view of a city.

Last year my daughter completed a similar bird's eye view drawing, but my son's turned out quite different. His drawing looks down on street full of buildings, where as my daughter's looks down on a point in the middle of a few buildings. In other words, his bird was flying much higher in the air down a street with rectangular buildings placed on a grid, and her bird was flying over a few building scattered together. Perhaps my son's bird was American and my daughter's was European?

This youtube video explains the steps for creating a city drawing from a bird's eye view.

How to Draw a City Using One-Point Perspective: A Bird's Eye View