Thanks for your comments.
The old wood effect is easy.
You need:
1 x Acrylic Valejo Model Color 70.990 Light grey
1x oil color Van Dyke Brown
1x oil color Cold grey
1x oil color neaples ylleow light
Underpainting with the acrylic, the whole surface
Now a thin glaze, semi-opaque, Van-Dyke-Brown
let it dry for 1 hour.
The first lights with cold grey, the follow lights cold grey with more and more neaples yellow light.
A bigger picture