Looks like you've just cut the Rough toolpath, if that's true then run the Finish toolpath before passing judgement. If that is the Finish toolpath then create another Finish toolpath with a smaller bit.
Also you're using oak, oak has so much grain contrast that it hides a lot of carving detail. Try putting a little water or alcohol on a portion of the background to see if it brings out the background detail. One other thing to do that I can think of, is use a glaze to bring out the detail in the background. Read this great article written by Tim Merrill on 3D Glazing.
On background tutorials, check out the tutorials on Vectric's website under Support.
Maker of Chips