Yang San-lang always pursued impressionism, focusing on open-air painting and the change of shadows under sunlight as well as timing sequence. Apart from his emphasis on nature and the strength of the texture carried by the brushwork, the artist often used both brushes and palette knives to enrich the brushwork and reinforce the quality of and the paint's volume. Often, this one final touch highlighted the sense of reality and made the whole work alive.

This precious piece of "Chih Shan Yen" is one of Yang San-lang's rare huge paintings. The red and green colors at the center of the painting are in stark contrast with each other. The prodigious use of red-orange, deep brown-yellow and mixed colors as well as firm, hard touches and homelike feelings reflect the author's state of mind as well as the nobleness and elegance of the ancient houses. Therefore, this painting with its strong local flavor represents not just an artwork of Yang San-lang's, but also his life's pursuit of an independent painting style.