This youthful portrait of Martin was painted in the early 1760s, possibly while he was still an assistant the London studio of his fellow Scotsman Allan Ramsay. He painted himself with clear skin, rosy cheeks and wavy ginger hair. His casual pose and loose collar have a friendly informality. Martin made a copy of this work and presented it to his master Allan Ramsay, therefore he presumably felt it was well executed and a true likeness. His career as an independent portrait painter flourished from the mid 1760s onwards, undoubtedly aided by a commission to paint Benjamin Franklin who was in London in 1767. Franklin was so impressed with the likeness, he had a replica made to take home to Philadelphia.