Everything that CD says is a good idea.
Yes, I shoot images a little larger than I need, and crop in. I shoot with a high resolution and get a workable image for internet use. If I was shooting for print, I would shoot with higher resolution, and use more of the capabilities of my camera. I only shoot with a digital SLR fitted with a f1.8 50mm lens. No macro or zoom. My typical shot is from 36" to 48" away from the food. One source of light as well.
the meat thermometer was so far past the top reading, it read Taylor
"perhaps...but then again...maybe not..."