Auction search by artist and period
No photo needed. Name the artist and a period, and the agent searches Sotheby's, Christie's and Phillips. Send anything useful into an appraisal as a comparable.
Import your own results
Send the results you already have — a file, or rows copied straight out of a spreadsheet. Useful columns: artist, title, year, medium, dimensions, house, sale, date, estimate low, estimate high, price, currency, lot link and photo link. Artist and lot link are the two that must be there.