How would you find a line drawing value for a Matisse?

To find a line drawing value for a Matisse, start by researching recent auction results and sales data for similar works by the artist. Consult reputable auction houses, galleries, and art valuation databases for insights on pricing trends. Consider the drawing's provenance, condition, and whether it is a unique piece or part of a series, as these factors significantly influence its value. Finally, seeking an appraisal from a qualified art expert can provide a more accurate assessment.