It's rule of thirds. Grr..
ANyway, your pics..
YOu got the no-flash and steady-camera-mount concepts liao. Your
pics look better and sharper than before.
However..
1) Work on your framing. THat one is your no.1 killer.
2) Work on finding the correct focusing point, perform a lock
focus, i have already taught u that technique. Make sure part of
the car that is nearest to the viewer is in focus, not the middle
or the back.
3) Make sure the car is in focus, not the background. Your book is
in focus instead of the cars, as in your second pic.
4) White balance. Play with it until u get the correct natural
looking colour.
Thats all for now.