As the dead tree primer was black, a white dry brushing was first done all over it so that the base color will show out more brightly.
It look strange to see the white dry brushing over a black surface because the contrast is too extreme to be beautiful but this will help for what is to follow.
The white base coat helps the beige color to come out well. Without the white base coat the beige would have look much more darker.
Same thing for the roots, the white dry brushing help pull out the red brown color.
Here is the dead tree with the first color layer applied.
Some more colors are added for more contrast.
Even the ground is retouched to add more highlight on some areas.