The difference between overlooking and overlooking

I looked down at the Colorado River about 2000 meters below.

I look down on the Colorado River, which is more than two thousand meters away from me.

Look down on sb.

The director looked down on the actors from the car.

The director looked at the actors below from the camera car.

Look down upon/despise sb.

Her parents told her not to look down on country people.

Her parents told her not to look down on country people.

Satisfied, please adopt, thank you!