After a long time, here is a V2.0 of the map.
I changed or upgraded almost every texture with normal maps to have 3D light effects and good looking textures.
The curves of the racetrack are now 4x more detailed because they were not very round and seemed drawned with a ruler.
The track surroundings are extended to feel more real and not blocked inside a small track. There are now different kinds and heights of grass to seem more natural.
For night lights, most of them are now lighting poles and not some hidden lamps on the ground.
I added electrical powerlines to the secondary road, the real sun trajectory, the Pyrénées to the south, an ATV (needed when go-karts are stuck in the sand
), reworked the main building with a more detailed garage in the back.
Everything is more eye-pleasing and looks a lot more like the real place.