I've just made a batch of brooches and earrings and had a terrible time getting halfway decent photos. I've used Perfect Pearls which is a powder containing a resin which when brushed onto polymer clay, when baked gives a beautiful pearlised/metallic effect. Some have photographed better than others. Part of the problem is the textures I've used. The deeper textures have been the hardest to photograph. I've listed some of them on Artfire and will list some on Folksy.