Light and Dark influence

What has been realised is that colour is only one aspect of fear. The main driving force is light and shadow, this was very apparent to me when I viewed the image below.

                               

http://browse.deviantart.com/?q=horror%20landscape&order=9&offset=0#/d2wz5g4

The sharp edges pierce the sky with strong contrast of shadow, we see the silhouette of a horseman we're not sure if he is good or bad. Cool colours remain in the background while warms colours are at the foreground.

I want my final pieces to have a similar feeling where security isn't absolute.