I did the drawing above this week at the Museum of the Order of St John, in Clerkenwell.  The museum tells the history of the Order of St John, established in eleventh century Jerusalem to provide medical care for sick pilgrims, and then acquiring a military role in the crusades.  After a complex history, it is now the St John Ambulance Brigade.  A second drawing, below, shows the process I am using quite a bit at the moment, drawing in coloured pencil onto a pre-prepared background of water colour.

The two drawings below were done at the National Army Museum in Chelsea.  The first is a display related to the battle of Waterloo, the second, a display of historic army uniforms.