The police vehicles look a bit too shiny from the outside, which might be partly also because of lack of texture. They look a bit too much just rendered. Especially the grey parts of the cars stand out, as does the big block of grey replacement tire at the rear.

Maybe add some id for the police car on the roof to interrupt the clean grey.

Making the white parts a little bit darker might also help to blend it in more with the environment.

For the wishlist, some proper dedicated police force for CSAT and russian would be interesting.