Warren is known simply from one silhouette, of a man looking left. All of the information about Warren comes from Jackson’s Dictionary, where he is described as an average ability silhouettist working from the Victoria Gallery, Warwick. However, this has not been verified by further evidence. 279
Source: McKechnie (Author of, British Silhouette Artists and their Work 1760-1860)
Warren (McKechnie Section 1)