Thank you for submitting your item for appraisal. This appears to be a chinese ink drawing of the 19th century, signed with an artist seal 晁 Chao (rest illegible), depicting a scholar reading a book. Unfortunately no artist with a matching style or biographical data is currently listed. The estimate is based on similar drawings by lesser known artist actually sold at auction. There is no measurement for the sentimental value you might attach to the item.