How detailed could we make a sculpture of the earth the size of a soccer ball?
You could only strive to make as smooth a ball as possible. Maybe just paint it.
The tallest mountain on that scale will be 0.11 [m radius of the soccer ball] / 6371000 [m mean radius of the Earth] * 8848 [m Everest height] ≈ 0.15 mm. A thickness of a sheet of good paper.