A good illustration is always preceded by the exact observation of our enviroment. Only by the graphic studying of light and shadow(sic!) it is possible to create some realistic effect with the help of vectors. It is important (for me) that the illustration does not appear too perfect and soft because the nature is not always free from edges.
Illustration is first of all about capturing the audience. There is a need to create an image that has enough appeal to initially attract the viewer.

Artwork created by using none of the official Deliverance film posters, my imagination and Photoshop.