Johnson's signature works are usually small in format, tightly painted, delicately handled and richly colored Based on copious preliminary drawings and studies of specific trees in their natural environment, his paintings are accurate and inviting representations of Northeastern scenery and 'exquisite examples of the style that is now called Luminism.'
Johnson's artwork is characterized by its small size, meticulous attention to detail, delicate execution, and vibrant colors. These paintings depict accurately and invitingly the natural landscapes of Northeastern America, showcasing a refined style that is now recognized as Luminism.