The erratic behavior of the shading is due to a tree that caused the dimensional angles in the shading.
The reflections on vehicles are caused by the environment that it is in.
The more polished the paint the more it reflects like a mirror.
I didn’t want to outline the tires because I wanted to bring attention to the wheels and show how low the truck rides.
However, I will keep in mind all the suggestions for my next illustration.

Thanks for the comments.