How do you know if its an original painting by albert namatjira?

To determine if a painting is an original work by Albert Namatjira, check for provenance documentation that traces its ownership history. Look for signatures and markings consistent with Namatjira's style, as he typically signed his works. Expert authentication from a reputable art appraiser or institution specializing in Indigenous art can also provide confirmation of authenticity. Additionally, compare the painting to known works by Namatjira for stylistic similarities and adherence to his unique techniques.