nice pics, i think that some may be a bit too plain though, maybe try getting some blur, or fool around with inverting the camera, i have some shots like that in my gallery, to which you have already visited, but if you study them, you see that inverting the camera, or blurring, or just a cool angle, like the corner of a car looking back. All that make the pictures fun to look at, i was guilty of plain pics when i first started, but i think i mix it up now. As for the darkness. I like to do that sometimes too, especially in night-races, but in my better daytime pics, i use between a .8 and 1. exposure.