What is the difference between Nadal's works and early portraits?

As a first-class portrait photographer in France, Nadal has created many wonderful portrait works with his artistic talent.

Early portrait works, due to long exposure, mostly appear stiff and lifeless, and it is difficult to express the character. Nadal's portrait works, on the other hand, focus on depicting the mental state of the characters, which sets a good example for portrait photography in later generations. Nadal believes that a photographer, regardless of the mechanical performance of the camera, should focus on the face of the character, grasp the expression of the character, portray the psychological characteristics of the character, and let the personality of the character leap above the picture.