This is a graphite pencil silhouette drawing of a landscape view. It took about 10 minutes to create.
Adding a backdrop to the image and purposefully leaving all of the objects within this image as silhouettes makes the focal points and points of interest within the image stand out due to the fact that although there isn't a lot of actual detail in the image the viewer is still able to make out shapes and what the image could be a drawing of.
There is also implied lines drawn across this image from the right to left, the viewers eye is automatically attracting to the huge wide void where a building is, and is drawn along the silhouette line towards the second building. These buildings are the main points of interest and focal points within this image due to the fact that they stand out a lot more than everything else.

This is a graphite pencil drawing of some objects arranged on top of a table. It took approximately 20 minutes to create.
There are lines within these objects to give perspective to their shapes and to create depth within the image, it makes them appear three-dimensional. There is also a small foreshortening effect on the middle vases, for example the middle vase is huge due to the fact that it is in the centre of the image and it being the closest to the viewer, whereas the vase behind it is much smaller, not only because it is smaller in size but because it is further away.
The lines within the objects, aside from giving it a three-dimensional look also draws implied lines around the image because the viewers eye follows them across all of the objects around the image.
This picture is missing a backdrop which takes away from the image, if there was a backdrop the objects would stand out more. Furthermore if there was also a table or drapery it would make the objects seem right, and not floating in mid-air.

This is a graphite pencil drawing of an arrangement of objects on top of a table covered with drapery. It took approximately 25 minutes to create.
The main point of interest within this image is the flowers and vases on the table, from this vocal point an implied line is drawn across the image, downwards, following the folds of the drapery then to the right towards the table leg and up it back towards the vases and flowers. This makes sure that the eye goes around the entire image taking in most details.
There is however a number of things missing from this image that would help it to stand out more. For example a backdrop is not present, so there is no sense of depth and it doesn't make the objects stand out. Another example of things wrong with the is that the objects are kissing one another. This means that the objects are clustered tightly together on top of the table, if there was more room between all of the objects the eye would

This is a charcoal drawing of a sphere upon a table covered by drapery. it took approximately 20 minutes to create.
The charcoal is used to add shadow and lighting to the image and to give the impression of depth. The main focal point of the drawing, or point of interest, is the sphere and from this an implied line is formed from the sphere at the center of the image downwards towards the drapery. Here the charcoal has been used to create depth within the folds of the drapery to give it a more uneven and three dimensional look.
This picture has managed to capture the edges of the table underneath the drapery quite well as it has lessened the shadow around the edges causing an implied line underneath the drapery, giving the table more shape and depth.

This is a graphite pencil drawing of some objects arranged in a manner which draws an implied line around the image starting from the stereo, due to the blackness of it, then drawing your eye up the mannequins left arm and down its body then up the black wire back towards the stereo again.
The drawing uses the rule of thirds to position the stereo and the mannequin so that it attracts the viewers eye to rest at the main vocal points and not just glance at them. This further enforces the implied line and allows the viewer to take in the details surrounding the main focal points. like the windowsill which the radio is resting on.
This image is not perfect due to the fact that there is a blank space in the top right of the photo. This imbalances the image slightly due to everything being on the bottom left hand side and doesn't draw the viewers eye around the entire image.