Rule Of Thirds

The rule of thirds is basically a grid which is 3x3 over an image/piece of artwork, which helps you to position things to look more interesting. For example below is an image of a bottle in the foreground and sea water/mountains in the background. The bottle is positioned 2/3 of the way along the image horizontally as it looks more engaging when positioned like this. If it was positioned centrally it would not have as much of an impact.