Classic placement for luster is 10:00 and 2:00, 45-deg from horizontal, and far from the coin to make the light sources look "small". Make small changes from there to give best aesthetic appeal in the shadow detail.
However, the pic looks pretty good. My only input for improvement would be to turn down the exposure by 1/3 of maybe 2/3 stop to eliminate the blown highlights. I'd also recommend lowering the contrast by 1 click. This lower exposure is partially compensated with the lower contrast, and can be easily touched-up in post processing.
edited to add: the highlights around the letters "Sal" look like they could benefit from one stop smaller aperture on the lens. What aperture are you using?
The image below shows the areas of over-exposure:
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