http://digital-photography-school.com/11-quick-food-photography-tips-to-make-mouth-watering-images
1. Pick the freshest ingredients
Flaws are visible close up so the best ingredients make the best photos.
2. Lighting is everything
Back light is key to texture among other things that make the food look more appetizing.
3. Keep it simple
Take out distractions in the background (things that aren’t needed).
4. Keep the plates clean
Imperfections make the dish look messy and incomplete.
5. Vary your camera angle
Different angles are creative, interesting, and appealing.
6. Food shots eating out
You can also take pictures of food after taking a bite.