Let me start by saying I have zero experience w wood finishing. I’m making sofa end tables using live edge black walnut. Sanded them using 80,120,240 & 400. Used Real Milk Paint Pure Tung Oil mixed 1:1 with citrus solvent. Applied 3 coats and waited 2 weeks between each coat. Sanded w/ 400 grit between coats. I can see some striping or squiggly lines/marks throughout the wood in certain areas when the light hits at a certain angle. (Kinda looks like stretch marks 🤣) Is this just the nature/character of the wood or did I mess up? It doesn’t look “bad” necessarily. Any help/tips/info would be appreciated. In the photos below you can see where the slab was cut into two pieces (making 2 tables) and it's mostly in what would have been the center of the slab prior to cutting into two.