I'd like to address probably the most important ingredient of any image, and that is impact. I'm always encouraging clients to fill the frame with the subject, and is why I'm
occasionally addressed on our photography tours as 'Johnny impact'!
However, impact
can manifest itself in different forms from 'in-your-face', to the subtle. We're all familiar with the former, so let
us begin with the latter . . .

The Dolomites, Italian Alps.
The impact in this shot is in the lighting, i.e. high contrast, while the
scene itself falls within the low impact realm.

Geyser, Iceland. |

Guanaco, Patagonia, Chile. |
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Once again, the image at left has 'light' impact in the form of a
back-lit geyser eruption. At right, the impact hits us via the proximity
of the Guanaco's face. On that note it's a fact that close-ups of faces, be they
human or animal, will always be excellent impact material.

Icelandic ponies.
Decide for yourself . . . is the impact of this shot the result of an unusual
perspective, the tight framing, the back-lighting, or the selective focus
technique? Perhaps it's all of these ingredients?

Lone figure on a Normandy beach, France.
This particular image contains an empty expanse, but I'm assuming it stirred some form of emotion within you, right? Good, that's impact! Now
last but not least, the humble silhouette . . .

Wheat, the Palouse, Washington State

Point du Raz, Brittany, France.
Place a good solid black subject in front of the sun or a
sunrise/sunset and you have immediate impact every time. This is true regardless
of the subject of the silhouette, even power lines. Not so sure about that? OK,
how does this impact you?! . . .

Power lines at sunset.
As you can see, impact comes in many forms, and I encourage
you to go out and add this useful tool to your photographic toolbox.
You can read more regarding 'The Power of the Silhouette'
here. 
Remember that whatever you photograph, the end result is limited only by your imagination!