Thank you for submitting your item for appraisal. This appears to be a faded reproduction offset print laid down on canvas, after the famous "nude in a chair" painting by Renoir. Compared to the original painting the colours have very much faded and mostly the blue (more stable) colours remained. The canvas is still white and has not turned brown, which is a clear indication that this is just a reproduction print. You can examine the print with a loope / magnifying glass, you should find small round dots typical for offset prints.
The estimate is based on similar items offered or sold at auction. There is no measurement for the sentimental value you might attach to the item.