From 1895 to 1899 Bell was an instructor at the Liverpool University school of architecture.
During this time he became associated with the Della Robbia Pottery in Birkenhead and also was becoming increasingly successful as a book designer and illustrator.
He continued to paint and exhibited at the Royal Academy, the New English Art Club and the Royal Society of Painters in Water Colours,[3] as well as at the Society of Graphic Art's first exhibition in 1921.
[5] He designed the great mosaic in the tympanum at Westminster Cathedral from sketches left by the architect John Francis Bentley; the work was completed in 1916.
He died in London on 27 November 1933, aged 70, and his ashes were interred in St James's Church, Piccadilly.