Despite that previous statement, I do believe that the travel photography community is stronger than it has ever been. Yes, traditional forms of income-generation are dying, but the evolving world has opened up a thousand different doors for those willing to take the risks to make it in the industry. And, yes, there is a lot of competition out there in the travel photography world, but the community is strong and the amount of camaraderie rather than jealousy in the business absolutely floors me nearly every day.
The image of Sapphire Kiu; a Hong Kong-based model (above), was made in early December 2018 on the famous (or infamous, depending on your point of view) Temple street, and will be part of a forthcoming audio slideshow (aka photo film) titled "The Songstress of Temple Street". It will tell the story of Qin Yi, a famous Shanghai singer in the 1930s, who "returns" to Hong Kong where she started her career. Some of the images were made in Temple's Street Canton Singing House and the Tin Hau Temple.
It's best to ask permission if you want to photograph someone, especially if you are working in close. Engage them before you pull out your camera. Learn at least how to say "hello" and "May I make a photograph" in the local language—just showing that you've made a little effort helps. Explain to them what you want to do and what it is about them that made you want to make a picture. If approached in an open and friendly manner, most people will be agreeable—many are flattered that someone has shown an interest in them and what they do. In places where there's a lot of tourism, you may run into people who are tired of being photographed—many tourists are not courteous enough to ask permission, and local people can come to feel abused and exploited. The only way to overcome this is to spend time with the people or to go to parts of the place less frequented by tourists.
Make use of people to give your images life and scale. If the facade of a particular building appeals to you, the picture may be that much better if you show people walking in front of it. They will give it scale and also let viewers know what sorts of people live there, how they dress, and the like. An outdoor café may be more interesting crowded with people than empty.