Question

I want a poster on Clean Fuel Better Life. You can send picture of poster from anywhere but it should be good enough because this a national level competition

Answer 1

Hi!
You can divide your sheet in 2 equal halves and make one big green color arrow between them.
On the first side make a fuel bottle (black color) and the you can give an effect of pollution or smoke and a car. This side should be black and white.
On the second side you can make a bottle of fuel with green colour and show the useful effects of fuel in your painting.
Best of luck for your competition

Answer 2

this may help you 
i think the third drawing  will help you the most