How do find out how much an original painting by Andre Derains is?

To determine the value of an original painting by André Derain, you can start by consulting auction house records, art galleries, and online art marketplaces that specialize in fine art. Additionally, consider seeking appraisals from professional art appraisers who specialize in 20th-century art. Researching recent sales and exhibitions featuring Derain's work can also provide insights into current market trends and pricing.