Hi Adrian – it sounds like you had a rather interesting learning experience on your recent trip. It really sounds like you have discovered some limitations in your own creative and technical skills. Unfortunately, the only way to get better is to keep on shooting, reviewing your work and improving both your compositional technique and getting to know your camera better.
A few thoughts for you:
1. Start with situations that are within your skill / comfort range. Shooting a static, well lit scene is going to likely give you better results than a situation with poor lighting where the subject is moving towards you. As you master a particular shooting situation, move on and try something incrementally new until you master than; and
2. Practice before you head out on your travel – I grab my camera whenever I head into town. I may or may not shoot, if I don’t find what I want, but the incremental practice in an environment that I know well gives me the practice I need so that my skills are honed when I get into an unfamiliar shooting situation.
I figured this out some time ago; I noticed that the images I took on my travels got better as the trip went on. We started getting out and did some fairly heavy duty shooting around town before heading off on a trip and our shooting skills were up to snuff on arrival.
3. Review your images as soon as you can. I always travel with a computer or table and review my work daily. That lets me things that are working for me and things that are not and I can adjust my techniques (compositional and technical) for the next day.