How to distinguish between Yan body and Liu body? What are the characteristics of each of them?

The facial strokes are thicker and rounder. The contrast between horizontal and vertical is very obvious. Willow style strokes are tougher and tougher. The contrast between horizontal and vertical is not very prominent. The tail is shorter and the hook is harder.

In terms of writing a word in a square, the characters in the Yan style are fuller and have smaller gaps. The words in the Willow style look much thinner and tougher