Generally it doesn't take more than a day and a half to finish painting a portrait, but this one, relying on recollected memory for its completion, took more than two months before it was declared perfect. In the course of the work, the son who had commissioned the portrait brought his father, nearly 70 years old, from Hsinchu three times.
一般一張畫像不過一天半的時間就可完成，這張要靠記憶的追想完成的畫像，卻進行將近兩個月才大告功成。過程中，訂畫的兒子載著他年近七十的父親從新竹來了三趟。