A work of art, with all of its diversified richness, is truly a great example of irreplaceable realism; also realistic is the methodological condition for those who are prepared to make a fact-finding investigation in order to determine the price.

Each aspect, each specific feature in every field possesses enough importance to immediately affect the value of the artwork. The facts about the work, such as proof of authenticity, endorsement, provenance, state of conservation, frequency, or not, of changes of ownership on the market, general availability and market demand, directly contribute to provide crucial elements.

The valuation criteria must also take into account the aesthetic, historic, cultural and public value, and the sum of these factors shall contribute to fixing the market value.