Good concept on most pics, but heres my honest feedback.
The drifting pics - i would have cropped out more of the grass/sand area, and perhaps made it a wide angle shot. I would have blown the pic up a bit as well, so it makes you focus on the car rather than everything around it.
Flower pic - you cropped too much of the good bits out (the orange flower itself), but i guessing this was due to the edges not in focus.
Certificate of marriage shot - Great concept!! Would have filled in the blacks more to made the shadows stand out and give that extra special feel to the pic..
The show car shots - well im sorry dont find it special. You have cropped out most of the car
This is my honest feedback. Only way to learn and perhaps take my feedback into the next set of shots you take.