You can get 3D model for free and you can import it in to Daz.Nice render, where did you get those cars, if you don't mind me asking?
I've looking for that Porsche for a long time
I "pushed" your second (nice btw.) render thru my external Denoiser-App and here is theView attachment 3624874
second render, i'm not sure how to get rid of the grain and make it look sharper. im thinking i also gotta make the eyes less glossy