The painter George James was born in London and died in a prison in Paris in 1795. Here's an illustration of one of his paintings form 1768:
http://www.tuningsinthirds.com/GJames/ A young girl is holding a small English guitar. The instrument looks convincing. She could cope with peg tuning!? R.B. Armstrong, writing about the English guitar in 1911 noted three different sizes of EG. Perhaps this is an example of the smallest size. To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html