Hey, Best thing with photo's is to take them in natural daylight, have a good focus on your camera to pick up detail and photo editing websites like
http://www.picnik.com/really do wonders! so easy to use and free :D you're shop is looking good, make sure to use all your tags when listing an item to make sure you get as many possible views, maybe use different backgrounds for each piece to grab interest. I'm only new so my advice my not be much but I hope it kinda helped :)