One useful guideline is to put things off centre a bit. Here, you can improve the photo by cropping 20 or 30 pixels above the flame, and similarly outside the right edge of the shadow. Getting close often gives a punchier, tighter, stronger visual result. A bit more lighting on the zippo itself would have revealed more details - as is the textures looks a bit soft, and it's hard to appreciate the wear and tear, grunge and grime. It's difficult to shoot a scene with a bright light source in it, as the dynamic range from darkest to brightest element can exceed the camera's ability to capture faithfully. Here, the flame is a pretty featureless white, but luckily the image transitions into that quite softly and smoothly and it looks ok.
Keep shooting... more variety of things the better.
Cheers,
Tony