Custom portraits from photo: ...Not just a copy from a photo itself....

I'd like to make a brief (as brief as it's possible) picture of the concept and development of the representation of nature by artists in the history of art; so that an approach by the viewer to the matter of portrayal from photo, would be more complete and comprehensible.
The birth of photography goes back approximately 1839. This event had a crucial effect in the artistic field. We can in fact combine the birth of "Modern Art" with the diffusion of photography. And from here "Impressionism" and all the other trends that, to the ancient conception of art as mimesis (as imitation of things) replaces art as creation (art as expression, as free interpretation of the artist). With the birth of photography by representation, painting was freed of the task of objective reproduction of images. Until this moment in fact, the artist was always bound to the need and desire to reproduce nature in its objectivity: The search of volumes, the study of optical laws, the invention of the prospective...
However, from that moment onwards it was no more necessary for painting to fulfill that function which photography could carry out better and at minor cost. The task of the artist therefore was no longer to make a copy as near as possible to reality. The value was now in the feeling that the subject expressed.
But photography did not "kill" painting. In reality their path was interlaced and the first photographers were also painters (Daguerre and Talbot) and photography became considered by many painters like a valid aid in order to study and fix the appearance of the reality. Photography and painting are therefore different but parallel expressions of the empiricist vision of the material world.
Photography frees painting of the exactitude of representation and the latter regains thanks to this, the freedom of action ("to paint not the things, but the effect that it produces "). All this forced the artists to explore field inaccessible to photography and without such solicitation "Modern Art " would not have become what it is today.....