A portrait he painted of Robert Harrison , 1715 - 1802 , is displayed in the National Portrait Gallery , London .
These paintings earned Bell the patronage of Lord Delaval , and in 1775 he exhibited two views of Delaval Hall .
A portrait Bell painted of Robert Harrison , 1715 - 1802 , is displayed in the National Portrait Gallery , London .
These paintings earned Bell the patronage of Lord Delaval , and in 1775 he exhibited two views of Delaval Hall .