Our information for T Matthews stems from Graves and Foskett who recorded Matthews as an artist who submitted a portrait to the Royal Academy in 1811 or 1813. The portrait in question is a silhouette of George III, painted in watercolour on paper. This is the only information currently available for T Matthews.
Source: McKechnie (Author of, British Silhouette Artists and their Work 1760-1860)
Matthews, T. (McKechnie Section 2)