Demonwolff has a point about polishing and burnishing. My experience echoes his advice.
Artist grade linseed oil is super refined and does not weigh down the natural color of walnut. It will oxidize over the months following the finish. In my experience artist grade linseed oil will mature to its full color in about 6 months but it will be nowhere near as dark as raw oil or Tru oil which in addition to darkness also has a brownish tint.
It is a beautiful and dramatic piece of walnut. Worth doing well.
