Exercise - Object in different positions in the frame

I was thinking what I wanted to choose, a very clear and set object in a large, even background.
I saw my own car parking near the field and thought it should be OK because of the colour (bright yellow) against dark gloomy sky.

a) object in little away from lower right corner













b) object in the corner














c) object in the lower centre













d) object in centre
less sky











The above are in order of preference. I have heard about "rule of third" before from every where from photography books to photography magazines. They all talk about it.
It does make the photo becomes more balanced and enable a viewer of the image to interact with it more naturally.

The top 3 photos where the car is at the lower of the frame, make the sky more prominent.
I like the the first photo where the car is in the little off right of the frame the most because it directs your eyes to view the left of the car which contain a vast field.