David Thomas showed drawing ability from an early age, which was one reason for his decision to become an architect. Drawing and painting became lifelong hobbies, and early retirement gave him the opportunity to develop them more seriously.
In addition to his artwork, he designs and makes devices as diverse as an artist’s folding easel and a walking frame.
His portraits have generally been commissions, often of children. He runs occasional portrait workshops and gives portrait demonstrations to local art societies.