Another Hulett watercolor, this from the late forties or early fifties. It's a color reproduction from his second Walter Foster art book, in the "California watercolor" style. Beneath it he includes this short tutorial:
Perspective can mean aerial or distance as vanishing points. We look down on the city and we also look out to the distance beyond.
I don't feel it's important not to get "hung up" on vanishing points when you are trying to say something about a given subject. If you feel it can help strengthen your picture, then use it.
Remember, it's just another tool to be used as the artist chooses.