Might I recommend TruOil which is a wiping varnish - it coats the outside and has some linseed oil in it so is compatible with an oil finish underneath. There are other similar varnishes that may cost less at HD and Lowes etc.
Oil finishes will soak into the wood, when dry with enough coats will shine a little.They will uniformly darken the wood so may make the wood detail look better.
TruOil will cover the top with depth and shine.
The below is fancy or exhibition walnut. Made by user "Flypaper" on falfiles. I put a mix of BLO and Truoil for first coat, then did like 5 more coats just Truoil. No sanding in between, I think it was 225 sanded and I wanted a decent grip. My bottle of TruOil wasn't drying as fast as people say, so I assumed there might be a problem, and bought some Japan Dryer and added in which solved that.