A 19th century miniature on ivory of a young lady

the three quarter portrait of the young lady wearing a blue-off-the-shoulder dress with lace detail, contained within an oval brass frame, the reverse of the frame with written inscription to paper label 'painted by Miss C. C. Thornton?? 25 George St Edinburgh'

length with frame 7.5cm

Condition: The ivory with chip and minor loss to the edge. Otherwise colour is good and strong and in good overall condition