As a visual art, the difficulty of basic course teaching is to maintain
"inspiration" in the process of painting. The first impression inspired by the
observation of an object is called the primacy effect from the perspective of visual
cognitive psychology. This is the source of artistic "inspiration" and one of the factors
that stimulate the motivation of sketching. How to keep the picture and keep the
fresh visual effect in the process of painting? According to the analysis, keeping good
"primacy effect" is one of the important links in the process of sketching teaching.