I started with the Dodge Challenger SRT10 model by v_chernobay on Turbo Squid as it was great practice for material editing and a pretty solid model. A few faces had to be fixed and the UV mapping wasn't great but it's a free model so I can't complain. I started by working through the materials and cleaning up the model. Then I started adding dirt and grime. I created the environment which is quite simple and finished it off with some dust on the car to make it look like it fit in better. I used some experimental features in blender specifically the adaptive subdivision which just ate aware all my RAM. Sadly it meant no GPU rendering either so I didn't bother making any sort of animation. I used clouds from our new cloud pack (although subtle) which you can pick up here: https://gumroad.com/l/Vertice_clouds