The bottom two pictures are really cool, with the headlight effects on the bikes, they work really well.

But I have some doubts about the others. Well, only a single doubt, to be precise: I feel many of them are too dark.

If you'll indulge me, take the picture quoted below as an example. I have looked at this thread on several different computers now, and the only computer I could make out the contents of this picture was an iMac with the screen set quite bright. If a picture is only viewable on very few screens, then that picture has a problem, wouldn't you agree ?