If you are a top notch, worldwide known photographer, it is very likely that customers from all over the world will want to use your services (for fashion, events, sports, architecture, products etc.). But as we are focusing on travel photography, commercial organizations that deal with traveling and tourism are more likely to hire you. Notable examples are hotels, tour companies, airlines and so on.
The deeper you travel into distant lands and cultures, the more varied the people you'll encounter. It can be fun and intriguing to meet people of vastly different cultures. It can also be alienating and even dangerous. I've seen women treated poorly, child labourers hard at work, and helpless animals suffering in the streets. Tolerance for other cultures is necessary to access these places and document the realities within them. Our job as photographers is to observe, with the hope that our images may influence positive social change.
When you travel, saving money is often the exact same as earning. Quite often, exchanging a couple images with a hotel for a free room or a tour company for a free tour is totally worth it. In fact, when I was in Southern Africa, I did this a lot. Safaris are expensive, so I’d create a couple images for a company to use for their marketing purposes in exchange for a free safari. It really is win-win.
In 2014, I worked with a major car brand, a rental car company, and a couple tourism boards. So far, in 2015, I haven’t worked with anyone, though it’s mostly because I’ve been off doing my own thing. There’s a balance here between going where you want and where the money is. Unfortunately for the weight of my wallet, I’ve always just gone where I want and only take on clients like this if it’s convenient.
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.