He is best known for his character Thrud the Barbarian, which originally appeared in White Dwarf magazine, and for his work for the Lobster Random comics.
To celebrate the character's status as a popular feature of the publication, Citadel produced a number of metal miniatures of Thrud.
[14] In an exposè published in White Dwarf towards the end of Thrud's tenure, art editor John Blanche wrote that Critchlow's "unique, chunky comic book technique provides the perfect vehicle for the biffoesque barbarian.
[19] This new combination of techniques was used in 2000AD for the Judge Dredd story Out of the Undercity and was initially well received and seen as a marked improvement over his previous fully painted style, with clearer figures and atmospheric computer colouring.
[20] By the end of the series, views on Critchlow's artwork were mixed, although some readers wanted to see him working on a story set above ground and in daylight.
[24] By the conclusion, Critchlow's style was recognised as unique, and even the previously criticised blues and greys were viewed as working well with other coloured elements.
[25] In 2004, Critchlow's work on the Judge Dredd story, Cincinnati was praised for showing further stylistic improvements and introducing more colour than had previously been used.
[28] Critchlow named Frank Frazetta as his principle formative influences, and he was inspired by seeing the work of Bryan Talbot's Luthor Arkwright series first hand.