A full-length portrait of Admiral Sir Peter Parker showing him facing slightly to the left. He wears an Admiral's full-dress uniform of 1795-1812, although the cuffs have not been correctly portrayed since they lack the fourth ring necessary for full dress. He wears a white waistcoat and breeches, shoes with gold buckles and a wig. In his right hand he holds a hat, and in his left his sword, decorated with an anchor and visible above his fingers. He is portrayed at the Portsmouth Battery standing in front of a cannon, which points out to sea to the left of the picture. His flagship, the Royal William, flies the Union flag, visible to the left, in the background, behind his right knee. The Royal William, 84 guns, was guardship at Portsmouth in 1799, although it had been cut down to a two-decker. The Union flag flying at the main mast signifies his rank as Admiral of the Fleet, which Admiral Parker became, as senior Admiral of the Red, on 16 September 1799.