With chemical etching instead of stamping, you could also use the technique of stoppings-out to get different shades of light and depth in the metal, to really give it a 3D look. I've noticed one problem is that the image is rather small. Not sure you can do this on your own, but there are companies out there that can mass produce very intricately detailed chemically etched metal parts. I did a quick Google search for chemical etching metal and found this one listed at the top: http://www.fotofab.com/cmp_advantage.php.
