shallow depth of field example: 2 factors that lead to the creation of shallow depth of field in this photo are, the natural overhead/back lighting, and the blurred background from taking the picture so up close to the leaf.
This picture shows a deep depth of field. Two things to remember when trying to get a deep depth of field photo is one having a wide focal length. This will make the photo deeper and second is zooming out will make your depth of field wider as well.
I like how this photo has so much too it even though it is just a bridge. The sky is really interesting with the rays of light coming through the clouds and how the bridge looks like it goes on forever