Sure, Albert. Its the 'standard' oil paint finish used by many builders of WW1 aircraft. First I paint the part with a light tan color water based paint. I use Tamiya desert yellow (its tan, not yellow). Then break out the artist's oil paint. I use raw Sienna or Burnt Sienna for a red colored wood, Raw Umber or Burnt Umber for a dark brown colored wood, like walnut, or I mix raw Sienna with some Yellow Ochre for a lighter colored wood. If the oil paint is used out of the tube, it will take weeks to dry. To speed up the drying time, I squeeze out some paint onto some brown cardboard and spread it out some. The cardboard absorbs the oil in the paint. After about 20 minutes or so, your'e ready to paint. I also mix a little 'drying oil' (sold along with oil paints) with the paint to thin it out. I may use some turpinoid (like turpentine), but not usually. Now I apply the paint over the tan paint on the part. Its better to use a coarse bristled brush to get a good wood grain effect. Varying direction of the brush strokes also gives a nice wood grain. Now set it aside for at least a week to dry to the touch. Then overcoat with a clear coat or Tamiya clear yellow or clear orange. Oil paints are a pain to use, but its the only type of paint I have found that works.
If you search around the web you'll find a number of tutorials on how to create wood grain using oil paints.
I hope this will help you out.