The texture and grain of wood has to be built up in layers. Sometimes though, you can take away oil rather than layering on even more.
It is using this technique that has allowed me to pick out the grain in this painting. I used a dentists tooth pick!! You scratch away the top layer of paint (which you have applied dark over light) and pull out the grain.
Once finished, Rowena will be day on a stool on a beautiful wooden floor.