You can learn about it through the encyclopedia link above. Below I will give you an analysis mainly from the aspects of calligraphy techniques, exclusive ~
From stroke analysis:
A European institution
European-style brushwork is tough, the structure is steep, and there is a little taste of the North Monument, like a handsome guy.
Two-character style
Yan-style strokes are vigorous and powerful, with a broad and rich structure, including the meaning of seal writing, such as majestic middle age.
Second, from the structural comparison:
The European body adopts the internal style, steep and high, like a slim and beautiful girl.
Yan's body is stretched, flat and wide, like a Hercules who can carry a tripod.
Painting is not easy, remember to adopt it!