In general, hawkers (as opposed to pedlars) had transport ie. a horse and cart of some description. They generally worked from door to door and often had regular rounds/routes that they followed. Pot hawkers – obviously selling wares from the potteries may have sold their goods close to canals or railways giving a more lucrative trade with more people around, but this is uncertain. As the inscription on the original mount suggests this watercolour may have been published in a journal or paper, possibly The Graphic.
John J. Willson was a landscape and sporting painter, he worked at Headingley, Leeds, and exhibited at Liverpool and the Royal Academy. He contributed works to The Graphic and was married to the painter E. Dorothy Willson.