i like the 2nd and the last tag

on your 1st tag it seems that its a lil bit dark
on your 2nd tag you could add more depth by darkening some parts of the tag
on your 3rd tag the c4d didnt blend well and the lighting is a bit off
on the 4th one the car lacks details maybe you can try sharpening it to make it more HQ

gj and KIU