Painting. [Alexander Nasmyth] / [Francis Grant, nd. c1830-48]. Oil on canvas, 76x63.5cm. Sitter was dentist to Queen Victoria [not Nasmyth the landscape artist]. Label on verso: Dentist to the Queen, Prince Albert and the Royal Children - Died August the 4th 1848. Portrait, HL to L, looking front, at table, r. elbow resting on book, head supported on hand
This is likely the portrait of Nasmyth exhibited by Grant at the Royal Academy in 1844, no 409.