"Favor will always favor the bold" applies to art. Try new things, take tons of shots, and keep a journal/notepad. Sometimes you'll have a great idea and nothing around to write it down, or you'll start taking shots and wish you remember how you got a certain effect (time of day, certain natural filter/shadow, etc). That website linked earlier about composition and fundamentals is good, bookmark that and read it over and over so you're in the field thinking about it. All-in-all, get really good at the basics, never stop shooting, and the truly artsy stuff will come with better understanding. Your gallery shows a good grasp so far, keep it up. And keep reading, tons of resources online and even youtube
just go out and the more you do it yourself the more ways you'll find how to do things on your own. it's how you will develop your own style.
But I'll give you one specific tip right now since I think this is more along the lines of what you're looking for. When you see a picture you want to take, don't just settle for the first angle or first thing you see. examine the subject and walk around and look around for different angles or different ways to capture the photo.
lol, yes I suppose that would be the theory! also maybe that the first picture you see is also the easiest one, a shot that might require a little more though could be the better photo. Either way, I end up shooting TONS of photos of the same thing anyways. lol
As a semi decent photographer myself (at least I'd like to think I am). I can say the composition is the number 1 thing to learn. The rules of thirds is the main thing to keep in mind. However there are other compositional rules you can use.
[link] This is a good article for the basic basics.