Not a bad shot Jay, though to me it looks like you lit the coin with a single spot light from around 3 o'clock. I think the coin would benefit from a macro twin-gun flash with the heads set at 2 and 10 o'clock, but with the 2 o'clock gun at full power and the 10 o'clock gun set to about 3/4 power. Not sure if you have a dedicated macro flash setup or not?