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. 
Embarking on such photographic projects make me look for relevant snippets of history, social mores and art (for example, the occupation of Shanghai by the Japanese in the thirties, the  Chinoiserie fad of the 18th century, fictional stories similar to that of Madam Butterfly et al). I also learned the aesthetic of the cheongsam (aka qi pao) in its various forms, and the beauty of Chinese calligraphy. I also scoured the internet for Chinese legends, poetry and songs/music that inspired the 2-3 minutes plots of my photo films; as I call these audio slideshows.
The third image is of Jinru Lee; a student and part-time model in Georgetown (Penang Island, Malaysia). It was made in late August 2018 under the sweltering sun of Penang, and inside the Cheah Kongsi Clan House Temple on Lebuh Armenian. I was in Penang to photograph the various Hokkien operas during the Hungry Ghost festival, and took the opportunity to set a photo shoot in its streets for a forthcoming audio slideshow (aka photo film) titled "The Phantom of the Opera". 
You can offer photography services to any business in the travel/tourism industry at your destination of choice. Opportunities are plentiful, whether you're selling your services or offering a trade. Going skiing in Colorado? Get in touch with local lodges about trading photography for a free stay. Vacationing in Vienna? Talk to the local tourism board about shooting a few photos for a fee. I recently made a deal like this in Cape Town shooting a month-long campaign with their tourism board, which resulted in a promotional blog post and lead to even more work. Remember that a strong portfolio goes a long way, and as it grows, so will your opportunities.
After spending the last 6 years fiddling and learning photography, my wife and I are about to move to Cambridge, UK from Melbourne. We are planning to post and write about our European trips in a capacity that is more than just telling our family what we are doing with the goal of allowing our work to eventually pay for our travel. Our first real post will be up soon, looking at our short weekend trip into the Wimmera/Mallee to visit the new Silo Art in the region. My Wife is a much better writer than I am and is currently editing!
×