I try to shoot everything full frame. The only time I rely on cropping for anything is when I'm shooting at a distance and my lenses can't reach the telephoto that's needed. Or the shot sucks and the random person walking by the frame is more interesting
I generally only have 3 framing methods, either dead center, rule of thirds, or way off on the side/in the corner.
The only way to get better is to do it all the time
http://www.flickr.com/photos/46518800@N00/sets/72157594456857273/
At some point I finally realized even if I never take another art shot in my life, I at least want to have a pocket camera on me at all times. It sounds dumb to want a blurry flash shot of you and whoever your with held at arms length when you have 10,000+$ in equipment available, but whatever gets the shot. memories like that are precious when you least expect them, and when you need them most.
Your work is good, you just need more of it

camera's are reletively cheap these days, and the compact feature rich camera market has gotten a lot better lately. canon has several cameras that have full manual mode, are pocketable, and have a very close macro focusing distance. the sony w100 is my personal choice for edc, mainly because its fast and has manual features, but maintains the smallest frame of any of the compact full manual camera's out there.
You can get something thats very useful that will get you shots that are suprisingly high quality for under 300$