-Divide the image into thirds (both horizontally and vertically) and you will find the best position in the crossing points of these lines (1) (see the image above: the rules of thirds).
-The main object can be position at the center of horizontal OR vertical lines (1)
-Don't position the object right in the center of the image (3).
(1)THE RULE OF THIRDS
The magical "Rule of Third" is one of the important rule in composition.
Someone say that rules are meant to be broken, but you should learn them first to make sure your composition will be correct.
The intersections of these four lines define the most important parts called "points of interest".
Position the important elements in these "points of interest" with the aim of .
This placement is better than a composition where the subject is placed right in the middle of the image because an off-centre composition is more pleasing to the eye and looks more natural.
You can choose to place your main subjects along the four lines too.
For example, if you sketch a person, set it along a whole lines.
Nonetheless this "hazard position", considerably off centre, it will result much more dynamic.
Just remember to , positioning other less important objects in the surrounding (according to the rule of thirds) to provides an "anchor", a natural focal point for the scene.
When you use the magical "Rules of Thirds" , searching a location where elements give you important hints to create better composition.
(2)THE CENTRE OF HORIZONTAL OR VERTICAL LINES
If you really have to position your main object in the centre of the image,, to avoid a static composition.
See this image: the sheep are positioned in the horizontal centre, but slightly in the left part too (they are not vertically centred too).
(3) THE CENTRE OF LANDSCAPE
In landscape sketches it is common to position the horizon along the centre of the image, splitting the composition in two equal part, but this can give a boring feel. Try to place it along one of the horizontal lines, following the "Rules of Thirds".
Two exercises to improve your composition skill.
1. Draw your sketch positioning the main subject in the centre of the image.
2. Choose carefully a good location to sketch, putting the main object, such a restaurant in cityscape or a seagull in seascape, in the point of interest or along the four lines of the "Rules of Thirds".
See the difference! Which composition is more dynamic?
1. In the first sketch, position the people in the point of interest, following the "Rules of Thirds"
2. In the second sketch, position the people off to one side of the image to provides some "breathing space" See the difference! Which compositions provide more "breathing space"?