An artist of this name advertised in the Cornishman on 31 Oct 1940, offering drawing lessons for children in Mousehole ('by an experienced teacher and artist'). 

Two correspondents (2012) have provided some further information about this artist, for which we are grateful. (Lucy) Mabel Culley was born in Costessey, Norfolk, where her father John Culley was a farmer. From census records it appears that she was from a large family of children, the maternal side coming from the Coleman family (of Coleman's Mustard fame). She later lived in Stevenage with or near one of her sisters, where she became a well known figure and published a booklet called A Stevenage Picture Book with a foreword by Lord Jowitt. The book contained 20 sketches and watercolours of her own work of scenes around and about the town. 

Many of these sketches can be found on the website, 'Herts Memories' as collated by V Richards.  Dates for this production are not confirmed as yet, however the author assumes they were made in the 1950s.  This would indicate that she had moved from Mousehole to Hertfordshire, possibly following the war`.  Mabel never married and her death is recorded in 1965 in Stevenage at the age of 85.