List difference in drawing techniques of Vincent Van Gogh in his carpenter drawing in 1880 / his old man in 1882? and why he used them?

There is difference of maturity and steadiness of lines seen in his two drawings from different years.

Explanation:

The carpenter drawing appears a little mellow ans docile. there is lot of fear and tepidness observed in the same. At the same time, the old man drawing of 1882, which is obviously is two years elder phase of his, shows dexterity in the application, style and finesse.