Why do the vehicles appear bad on the map I created?

In the video, the top one is the map I created. the bottom one is the utah map. i change vehicles with the tab key, but the vehicle images on my map are very black and bad. how can i make it like the utah map?

 

Try editing the “sunsky” object to resemble the one in Utah. Might help

 

Thanks for your answer but this didn't work. there is a different problem