Thank you for submitting your item for appraisal. This appears to be a modern copy after a detail of the famous painting by ZHANG Xuan (713-755) Lady of Guo Spring outing 虢国夫人游春图 , with a number of imitated collectors and an artist seal 簡靜皇? The artist is not listed in auction records. The estimate is based on similar paintings by lesser known artists in similar expensive frames offered or sold at auction.