Author portraits at Sotheby's.

Among other results, the June 17th auction at Sotheby's resulted in $5,000 for a signed pen-and-ink portrait of Arthur Conan Doyle;  a whopping $98,500 for an inscribed pen-and ink portrait of F. Scott Fitzgerald; and $2500 for a lot of inscribed British and Irish author portraits, which included G. K. Chesterton and E. Phillips Oppenheim.
About the image: E. Phillips Oppenheim, NYPL