i like the first and third photos. the 300zx looks decent, except the blur kinda got messed up a bit. typical gimp problem really. but did you do the blur on a separate layer ? coz that sort of problem stems from doing the motion/zoom blur on the same layer. another would be excessive blur distance. but they all look very good indeed. next time i would like to see you work on the whole photo itself, instead of just the blurs. you know, like the exposure levels and colour balancing and stuff like that. things are looking up i must say!