His paintings often explore the emotional weight of human experience. In Woman Dying, Johannot uses soft light and shadow to create a sense of quiet drama. He frequently depicted historical subjects, such as in A Scene of 93, which references the French Revolution. His portraits, including that of Maximilien Sébastien Foy, demonstrate a clear focus on character and posture. Unlike some of his contemporaries who preferred grand gestures, Johannot often chose moments of stillness. His use of colour was often restrained to keep the focus on the narrative.

Modern collectors value Johannot for his narrative clarity. His works like Children Offering Flowers and Wandering Children possess a gentle quality that suits domestic spaces. The compositions feel balanced and deliberate. His history as an illustrator ensures that every figure tells a story. These prints offer a window into the French Romantic period without the aggressive scale of traditional history painting. They provide a sophisticated atmosphere for a home gallery or study. Each piece reflects the careful labour of an artist who understood the power of the printed image.