More megapixels isn't necessarily a good thing.
Use manual focus, if you have it. Use spot metering, if you have it. Use your custom white balance, if you have it, and manual aperture and shutter settings. Underexposure is better than overexposure. As said above, use a tripod and timer, and super macro setting, and a low ISO, like 80 or 100. Use a larger resolution (at least 2000 pixel width), then crop your photos in a graphics program. Outdoor pictures will usually have alot of unwanted reflections. If shooting indoors, don't have the light source(s) too close to the subject.