Find Out What Your Oil Painting Is Worth

Artist attribution is the single most important value factor. A confidently attributed painting by a documented artist with auction records can be worth 100-1000x an equivalent unsigned work. Signatures on oil paintings are checked for: location (typically lower left or right corner, or on the reverse), authenticity (period ink, brushwork consistent with the artist's known hand), and correspondence with catalogue raisonne records. For important paintings, attribution by a recognized expert (institutional curator, dealer specialist, the artist's foundation) is required before auction estimates can be placed. Our AI performs visual style matching against auction records as a starting point for attribution research.

Oil paintings age through multiple processes: paint layer cracking (craquelure), canvas deformation, oxidation of the varnish layer (causing yellowing), and mechanical damage (tears, holes, abrasion). The key condition issues that affect value: (1) Paint losses — missing areas of original paint, often filled and inpainted by conservators; (2) Heavy overpainting — broad applications of later paint concealing original detail; (3) Canvas support condition — tears, deformations, previous relining (attaching the original canvas to a new support); (4) Varnish condition — heavily discolored varnish darkens the painting; professional cleaning can reveal the original palette. Condition reports from conservators are standard practice for significant paintings at auction.

Documented provenance — the continuous record of the painting's ownership from the artist's studio to the present — adds authentication credibility and sometimes historical premium. Key provenance indicators: exhibition at major institutions (Royal Academy, Paris Salon, Metropolitan Museum); publication in the artist's catalogue raisonne; documented inclusion in a major private collection (Wildenstein, Rothschild, Rockefeller); dealer gallery labels on the stretcher bars or canvas reverse; and auction records from previous sales. Provenance also serves as a "title check" — paintings with gaps in provenance history may have looting or export issues that affect legal title and saleability.

Subject matter significantly affects market depth and price ceiling within any artist's output. For most artists: nudes and erotic subjects (if culturally acceptable in the current market) > portraits of notable sitters > historical and mythological subjects > landscapes with figures > pure landscapes > still lifes > interiors. For specific collecting categories: Orientalist subjects (Middle Eastern settings) command premiums in Gulf market; equestrian and sporting subjects (hunting, racing) have dedicated British collector following; marine subjects (sailing ships, seascapes) have a dedicated naval history collector base. An artist's most canonical subject type commands the highest prices within their overall market.

Larger paintings generally command higher prices because they required more materials, more working time, and were produced for more ambitious patrons. However, size interacts with subject — a monumental still life may be less valuable than a small intimate portrait by the same artist if the portrait subject is historically important. For auction house consignment, very large paintings (over 6 feet in either dimension) have physical logistics challenges (shipping, display, insurance) that can limit the buyer pool. The condition of the canvas support is more critical for large works, which are more susceptible to tearing and deformation.

For paintings by major artists, inclusion in the catalogue raisonne — the comprehensive scholarly record of all authenticated works — is the highest form of documentation. Exclusion from a published catalogue raisonne does not automatically mean a painting is inauthentic (not all works of all artists are documented), but inclusion provides buyer confidence that justifies auction house acceptance and major sale premiums. For some artists (Warhol, Basquiat), dedicated authentication boards existed; for others, specialist dealers and museum curators provide expert opinions. The cost of authentication for a potentially important painting ($500-$10,000+) is typically well justified by the sale price differential.