Realism art in painting

Realist art adopts the approach of portraying subjects in as straightforward manner as possible, without idealizing them and without follow the rules of formal theory. Realism first appeared in art of the 18th century, however, the great Realist era was the mid-19th century, as artists becomes disillusioned with the Salon system and the influence of the Academies.

What kind of differences are there between the realistic and the classical painting?

1) Figuratively, the classical image is music based on notation; the realistic Painting is music without notation knowledge.

2) Technique. Everything in the classical Painting is finishing stage by stage in accordance with laws which were not invented by the author. The realistic Painting is created in one layer, "alla prima." There can be several layers but only because the author does not have time to complete the picture "in the wet".

3) Plot. In the classical Painting the plot is constructing in accordance with the classical composition laws. The realistic Painting school does borrow something from the classical school but there is no composition law as such: there are as many laws as there are in realistic artists.