He executed landscapes chiefly drawn from English scenery, and was a frequent exhibitor at the Royal Academy exhibitions from 1796 to 1829.
His subjects were landscapes, chiefly drawn from English scenery, but sometimes of a topographical nature.
He was an unsuccessful candidate for the 'Old' Society of Painters in Water-colours at the time of its foundation.
Powell was largely engaged as a teacher of painting in water-colours; Samuel Redgrave was among his numerous pupils.
An etching of a landscape by Domenichino, now in the National Gallery, is executed with "much force", in Cust's opinion.