M15: Probably Mary Lloyd, Countess of Rothes

By John Smart, signed ‘JS/1763’
Watercolour on ivory, 1 1/3rd ins.
Similar to M10, blue dress, blue shadows on face.
Second wife of John, 10th Earl, married 1763.
She married secondly Bennet Langton 1770.
Identity based on date and resemblance to the Reynolds portrait in the National Trust.