Great Vs. Shallow Depth Of Field

Great Depth Of Field: In the two photos on the
right the photographer's used a high f-stop
(aperture) in order to have evrything in frame, in
focus and sharp. This is usually used when taking landscape photos.

Shallow Depth Of Field: In the two photos on the left the photographer's used a low f-stop (aperture) to only have what they want to have in focus, and everything else in front or behind the subject of matter is blurred out to make the subject stand out.

Light Sources

Using One Light Source: In the photo on the right
of a woman on the beach was taken using a single
flash to give her face a more natural tone and to
stand out against the darker background.

Using More Than One Light Source: In the photo on the left of a man on the beach was taken using two wireless flashes. If you wanted to give your subject a more toned, defined look and to stand out you would want to use two flashes.