I would up the polys on the holes to 12 and try to get the wood to match the wood in the medieval theme since people will most likely be using it there, but it looks pretty good.
I also agree with the notion of adding more polys to the inner circles. The model doesn't look like it has a large amount of polys, so a adding more won't do any damage. Ps: make the wood darker and adjust the blue channel to allow more blue.
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