you could try and set out objects on a table and loosly sketch them.
when you are happy with the proportions you can add more detail. these
activites help to imporve you skills of looking for the small details.
and the proportions.

when drawing make sure your pencil is sharp and that you use the tip for fine lines
or small details. this will help to make your drawing more realistic.
use a blensing stump to create smoooth textures
use a rubber and stencil to get fine lines or lighter areas.
using the edge of the flat tip paint brush insures a smooth line that doesnt go over the edges.

When using the rule of thirds follow these steps.
if taking a landscape shot put the horizon on the top or bottom horizontal line.
when taking a photo of someone or an animal line there eye up with one of the intersection points.
or placing the eyes in both intersection points when the model in portriat.
when you want the backround as well as a figure put the figure on one of the too vertical lines.