Deuchars attended Duncan of Jordanstone College of Art in 1983-1987 where she obtained a first class BA Honours in illustration printmaking.
In 1987 she was accepted to the Royal College of Art where she studied communication, art and design. In 1989 she received an MA with distinction.
Deuchars is most known for her distinct style of using hand lettering, which she first used in a D&AD annual report in 2002. To mark D&AD’s 40th birthday, the Annual Review was called "What’s the point", which was art directed by Vince Frost and all 5496 words of the text was written in pencil by Deuchars.
Her distinguishable style has been used on stamps for the Royal Mail to commemorate the Royal Shakespeare Company’s 50th anniversary. Deuchars worked in collaboration with Hat Trick Designs to produce six stamps. Deuchars hand lettering also featured prominently for the British brand Cass Art, appearing in their shop front windows, as well as in Jamie Oliver cookbooks. For the past two year Deuchars has provided illustrations to Carluccio’s menus, designed by Irving and Co. Her 2009 book cover for Penguin Books for Burmese Days by George Orwell won the 2010 Book Cover Illustration Award from the V&A. Deuchars worked for several clients including the Guardian newspaper where she was the sole illustrator for the Saturday paper between 2005-2007. She has also made over 100 book cover designs for Editorial Losada publishing in Spain.
Deuchars has a bestselling series of books based on interactive art activities. Her first book was "Let’s Make Some Great Art", by publisher Laurence King contains a series of DIY activities. Her second book, "Let’s Make Great Fingerprint Art" was released in October 2012. She has also written "Let’s Make Some Great Placemat Art".