Haha, that is sooo cool :D. The car model is very nice and clean and the little guys make the scene a lot more interesting and even very funny. Very well done.
The little guys remind me of the Simpsons, don’t know why though, problebly the colour :).
I think I like the red one better for the blue one is so cold colored.
Really good renders, i also prefer the second one.
But isn’t there some noise on the wheels ? It is strange because there is noise nowhere else, so it looks quite strange to me. Or maybe the texture you used was noisy, don’t know.
Anyway this is a pretty good job.
I use blender 365 days this work: 3 days for compositions, 6 days for lighting, texturing, and searching good materials and making finish effect and making lots of beta-renders