[18] He was also invited to be artist in residence in Hiroshima City, to meet and paint portraits of hibakusha (survivors of the atomic bomb), as part of the exhibition Hiroshima Art Document[25] (the resulting series of portrait drawings now in permanent collection of UCL Art Museum, University College London [26]).

In 2014, his large canvas 'Tokyo Portrait' was bought by Fondation Carmignac in Paris, joining works in the collection by artists such as Andy Warhol, Roy Lichenstein, Jean-Michel Basquait, Keith Haring, Jeff Koons, Gerhard Richter.

[29] Fine art prints of his paintings are in the collections of King's College, Cambridge; National Poetry Library at Southbank Centre; Zoological Society of London; Channel 4 News Studios; The National Film and Television School; Akram Khan Dance Company; Curtis Brown Group; Aardman Animation, Bristol; Kent University; Hanway Films; Northern School of Contemporary Dance, Leeds; The Comedy Store; Bar Italia Soho.

[86] Earlier in his career, he was included in the 2004 group exhibition 'Being Present' at The Jerwood Gallery London, showcasing eight young UK figurative painters who primarily work from life.

[87][88][89] 'London Portraits' are a series of 15 paintings made upon Randall's return to the UK, of people who have contributed to their fields in British culture and society.

Participants include newscaster Jon Snow, actress Julie Walters, comedian Jo Brand, animator Nick Park, author/illustrator Raymond Briggs, novelist David Mitchell, actress Katie Leung, illustrator Dave McKean, poet Benjamin Zephaniah, movie producer Jeremy Thomas, film-maker Julien Temple, poet Simon Armitage, choreographer Akram Khan, zoologist Desmond Morris, actor Antony Sher and Director of the Royal Shakespeare Company Gregory Doran.

The portraits depict chef & author Pierre Koffmann; food critic for Bloomberg for 25 years Richard Vines; and restaurateurs/businessmen Leonid Shutov, and Roman & Mikhail Zelman.