Jang lived a poor life, but devoted himself to creating a peculiar art of painting characterized by vivid portrayal of subjects.

His main subjects were animals, flowers and birds.

One of his works is "Prunus Mume (Japanese apricot)" drawn on a ten-fold screen, successfully depicting an old tree with fine brush strokes.

Jang in his work "Soldiers and Horses" gave a lifelike portrayal of galloping horses and riders.

Included in his works are also paintings of still life.